Update makefiles after merge of Chromium at 278252

This commit was generated by merge_from_chromium.py.

Change-Id: I4008a4069f850fab091fa430287119539c097652
diff --git a/tools/gyp/mksnapshot.host.darwin-arm.mk b/tools/gyp/mksnapshot.host.darwin-arm.mk
index b4e46ee..1d9f066 100644
--- a/tools/gyp/mksnapshot.host.darwin-arm.mk
+++ b/tools/gyp/mksnapshot.host.darwin-arm.mk
@@ -80,6 +80,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
@@ -157,6 +158,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/mksnapshot.host.darwin-arm64.mk b/tools/gyp/mksnapshot.host.darwin-arm64.mk
index d69681a..c720b61 100644
--- a/tools/gyp/mksnapshot.host.darwin-arm64.mk
+++ b/tools/gyp/mksnapshot.host.darwin-arm64.mk
@@ -80,6 +80,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
@@ -155,6 +156,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/mksnapshot.host.darwin-mips.mk b/tools/gyp/mksnapshot.host.darwin-mips.mk
index daef43c..fccd75c 100644
--- a/tools/gyp/mksnapshot.host.darwin-mips.mk
+++ b/tools/gyp/mksnapshot.host.darwin-mips.mk
@@ -81,6 +81,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
@@ -160,6 +161,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
diff --git a/tools/gyp/mksnapshot.host.darwin-x86.mk b/tools/gyp/mksnapshot.host.darwin-x86.mk
index e582921..0b1f836 100644
--- a/tools/gyp/mksnapshot.host.darwin-x86.mk
+++ b/tools/gyp/mksnapshot.host.darwin-x86.mk
@@ -80,6 +80,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
@@ -155,6 +156,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/mksnapshot.host.darwin-x86_64.mk b/tools/gyp/mksnapshot.host.darwin-x86_64.mk
index c2a1b82..7999ffc 100644
--- a/tools/gyp/mksnapshot.host.darwin-x86_64.mk
+++ b/tools/gyp/mksnapshot.host.darwin-x86_64.mk
@@ -80,6 +80,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
@@ -155,6 +156,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/mksnapshot.host.linux-arm.mk b/tools/gyp/mksnapshot.host.linux-arm.mk
index 9fb2c82..6ca1bed 100644
--- a/tools/gyp/mksnapshot.host.linux-arm.mk
+++ b/tools/gyp/mksnapshot.host.linux-arm.mk
@@ -81,6 +81,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
@@ -159,6 +160,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/mksnapshot.host.linux-arm64.mk b/tools/gyp/mksnapshot.host.linux-arm64.mk
index 9c93950..c294369 100644
--- a/tools/gyp/mksnapshot.host.linux-arm64.mk
+++ b/tools/gyp/mksnapshot.host.linux-arm64.mk
@@ -81,6 +81,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
@@ -157,6 +158,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/mksnapshot.host.linux-mips.mk b/tools/gyp/mksnapshot.host.linux-mips.mk
index c1bd75f..3b45fb4 100644
--- a/tools/gyp/mksnapshot.host.linux-mips.mk
+++ b/tools/gyp/mksnapshot.host.linux-mips.mk
@@ -82,6 +82,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
@@ -162,6 +163,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
diff --git a/tools/gyp/mksnapshot.host.linux-x86.mk b/tools/gyp/mksnapshot.host.linux-x86.mk
index 80114cd..db2967e 100644
--- a/tools/gyp/mksnapshot.host.linux-x86.mk
+++ b/tools/gyp/mksnapshot.host.linux-x86.mk
@@ -81,6 +81,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
@@ -157,6 +158,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/mksnapshot.host.linux-x86_64.mk b/tools/gyp/mksnapshot.host.linux-x86_64.mk
index 98123a0..f59d483 100644
--- a/tools/gyp/mksnapshot.host.linux-x86_64.mk
+++ b/tools/gyp/mksnapshot.host.linux-x86_64.mk
@@ -81,6 +81,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
@@ -157,6 +158,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_base.host.darwin-arm.mk b/tools/gyp/v8_base.host.darwin-arm.mk
index e5163b2..7eaaf33 100644
--- a/tools/gyp/v8_base.host.darwin-arm.mk
+++ b/tools/gyp/v8_base.host.darwin-arm.mk
@@ -241,6 +241,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
@@ -324,6 +325,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_base.host.darwin-arm64.mk b/tools/gyp/v8_base.host.darwin-arm64.mk
index 9166d0b..2fe403f 100644
--- a/tools/gyp/v8_base.host.darwin-arm64.mk
+++ b/tools/gyp/v8_base.host.darwin-arm64.mk
@@ -244,6 +244,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
@@ -325,6 +326,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_base.host.darwin-mips.mk b/tools/gyp/v8_base.host.darwin-mips.mk
index 7c67240..fba800f 100644
--- a/tools/gyp/v8_base.host.darwin-mips.mk
+++ b/tools/gyp/v8_base.host.darwin-mips.mk
@@ -242,6 +242,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
@@ -327,6 +328,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
diff --git a/tools/gyp/v8_base.host.darwin-x86.mk b/tools/gyp/v8_base.host.darwin-x86.mk
index 1ed4c36..22e79d6 100644
--- a/tools/gyp/v8_base.host.darwin-x86.mk
+++ b/tools/gyp/v8_base.host.darwin-x86.mk
@@ -239,6 +239,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
@@ -320,6 +321,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_base.host.darwin-x86_64.mk b/tools/gyp/v8_base.host.darwin-x86_64.mk
index 08210f6..837bd68 100644
--- a/tools/gyp/v8_base.host.darwin-x86_64.mk
+++ b/tools/gyp/v8_base.host.darwin-x86_64.mk
@@ -239,6 +239,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
@@ -320,6 +321,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_base.host.linux-arm.mk b/tools/gyp/v8_base.host.linux-arm.mk
index 51f35fc..823c2bd 100644
--- a/tools/gyp/v8_base.host.linux-arm.mk
+++ b/tools/gyp/v8_base.host.linux-arm.mk
@@ -242,6 +242,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
@@ -327,6 +328,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_base.host.linux-arm64.mk b/tools/gyp/v8_base.host.linux-arm64.mk
index 0d95a2e..ac09f82 100644
--- a/tools/gyp/v8_base.host.linux-arm64.mk
+++ b/tools/gyp/v8_base.host.linux-arm64.mk
@@ -245,6 +245,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
@@ -328,6 +329,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_base.host.linux-mips.mk b/tools/gyp/v8_base.host.linux-mips.mk
index 1c1be86..d91197a 100644
--- a/tools/gyp/v8_base.host.linux-mips.mk
+++ b/tools/gyp/v8_base.host.linux-mips.mk
@@ -243,6 +243,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
@@ -330,6 +331,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
diff --git a/tools/gyp/v8_base.host.linux-x86.mk b/tools/gyp/v8_base.host.linux-x86.mk
index 889e3e4..100037f 100644
--- a/tools/gyp/v8_base.host.linux-x86.mk
+++ b/tools/gyp/v8_base.host.linux-x86.mk
@@ -240,6 +240,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
@@ -323,6 +324,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_base.host.linux-x86_64.mk b/tools/gyp/v8_base.host.linux-x86_64.mk
index ce1dbe9..9f56f23 100644
--- a/tools/gyp/v8_base.host.linux-x86_64.mk
+++ b/tools/gyp/v8_base.host.linux-x86_64.mk
@@ -240,6 +240,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
@@ -323,6 +324,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_base.target.darwin-arm.mk b/tools/gyp/v8_base.target.darwin-arm.mk
index 2fa376e..a5fdf00 100644
--- a/tools/gyp/v8_base.target.darwin-arm.mk
+++ b/tools/gyp/v8_base.target.darwin-arm.mk
@@ -265,6 +265,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
@@ -384,6 +385,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_base.target.darwin-arm64.mk b/tools/gyp/v8_base.target.darwin-arm64.mk
index 6f3ab56..23a96ed 100644
--- a/tools/gyp/v8_base.target.darwin-arm64.mk
+++ b/tools/gyp/v8_base.target.darwin-arm64.mk
@@ -258,6 +258,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
@@ -364,6 +365,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_base.target.darwin-mips.mk b/tools/gyp/v8_base.target.darwin-mips.mk
index 7bde1fb..873d97c 100644
--- a/tools/gyp/v8_base.target.darwin-mips.mk
+++ b/tools/gyp/v8_base.target.darwin-mips.mk
@@ -260,6 +260,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
@@ -375,6 +376,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
diff --git a/tools/gyp/v8_base.target.darwin-x86.mk b/tools/gyp/v8_base.target.darwin-x86.mk
index 681a125..8b51786 100644
--- a/tools/gyp/v8_base.target.darwin-x86.mk
+++ b/tools/gyp/v8_base.target.darwin-x86.mk
@@ -258,6 +258,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
@@ -369,6 +370,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_base.target.darwin-x86_64.mk b/tools/gyp/v8_base.target.darwin-x86_64.mk
index f4c0b4c..703894b 100644
--- a/tools/gyp/v8_base.target.darwin-x86_64.mk
+++ b/tools/gyp/v8_base.target.darwin-x86_64.mk
@@ -257,6 +257,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
@@ -367,6 +368,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_base.target.linux-arm.mk b/tools/gyp/v8_base.target.linux-arm.mk
index 2fa376e..a5fdf00 100644
--- a/tools/gyp/v8_base.target.linux-arm.mk
+++ b/tools/gyp/v8_base.target.linux-arm.mk
@@ -265,6 +265,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
@@ -384,6 +385,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_base.target.linux-arm64.mk b/tools/gyp/v8_base.target.linux-arm64.mk
index 6f3ab56..23a96ed 100644
--- a/tools/gyp/v8_base.target.linux-arm64.mk
+++ b/tools/gyp/v8_base.target.linux-arm64.mk
@@ -258,6 +258,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
@@ -364,6 +365,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_base.target.linux-mips.mk b/tools/gyp/v8_base.target.linux-mips.mk
index 7bde1fb..873d97c 100644
--- a/tools/gyp/v8_base.target.linux-mips.mk
+++ b/tools/gyp/v8_base.target.linux-mips.mk
@@ -260,6 +260,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
@@ -375,6 +376,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
diff --git a/tools/gyp/v8_base.target.linux-x86.mk b/tools/gyp/v8_base.target.linux-x86.mk
index 681a125..8b51786 100644
--- a/tools/gyp/v8_base.target.linux-x86.mk
+++ b/tools/gyp/v8_base.target.linux-x86.mk
@@ -258,6 +258,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
@@ -369,6 +370,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_base.target.linux-x86_64.mk b/tools/gyp/v8_base.target.linux-x86_64.mk
index f4c0b4c..703894b 100644
--- a/tools/gyp/v8_base.target.linux-x86_64.mk
+++ b/tools/gyp/v8_base.target.linux-x86_64.mk
@@ -257,6 +257,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
@@ -367,6 +368,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_libbase.host.darwin-arm.mk b/tools/gyp/v8_libbase.host.darwin-arm.mk
index 12288b5..d705525 100644
--- a/tools/gyp/v8_libbase.host.darwin-arm.mk
+++ b/tools/gyp/v8_libbase.host.darwin-arm.mk
@@ -72,6 +72,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
@@ -149,6 +150,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_libbase.host.darwin-arm64.mk b/tools/gyp/v8_libbase.host.darwin-arm64.mk
index e5f12a5..e19f14e 100644
--- a/tools/gyp/v8_libbase.host.darwin-arm64.mk
+++ b/tools/gyp/v8_libbase.host.darwin-arm64.mk
@@ -72,6 +72,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
@@ -147,6 +148,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_libbase.host.darwin-mips.mk b/tools/gyp/v8_libbase.host.darwin-mips.mk
index 87b4e74..132e77e 100644
--- a/tools/gyp/v8_libbase.host.darwin-mips.mk
+++ b/tools/gyp/v8_libbase.host.darwin-mips.mk
@@ -73,6 +73,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
@@ -152,6 +153,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
diff --git a/tools/gyp/v8_libbase.host.darwin-x86.mk b/tools/gyp/v8_libbase.host.darwin-x86.mk
index f1081cd..c796fc0 100644
--- a/tools/gyp/v8_libbase.host.darwin-x86.mk
+++ b/tools/gyp/v8_libbase.host.darwin-x86.mk
@@ -72,6 +72,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
@@ -147,6 +148,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_libbase.host.darwin-x86_64.mk b/tools/gyp/v8_libbase.host.darwin-x86_64.mk
index 8c3764f..be9ff47 100644
--- a/tools/gyp/v8_libbase.host.darwin-x86_64.mk
+++ b/tools/gyp/v8_libbase.host.darwin-x86_64.mk
@@ -72,6 +72,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
@@ -147,6 +148,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_libbase.host.linux-arm.mk b/tools/gyp/v8_libbase.host.linux-arm.mk
index 2b8857e..6edd27e 100644
--- a/tools/gyp/v8_libbase.host.linux-arm.mk
+++ b/tools/gyp/v8_libbase.host.linux-arm.mk
@@ -73,6 +73,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
@@ -151,6 +152,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_libbase.host.linux-arm64.mk b/tools/gyp/v8_libbase.host.linux-arm64.mk
index c4e1be5..b0cbe85 100644
--- a/tools/gyp/v8_libbase.host.linux-arm64.mk
+++ b/tools/gyp/v8_libbase.host.linux-arm64.mk
@@ -73,6 +73,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
@@ -149,6 +150,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_libbase.host.linux-mips.mk b/tools/gyp/v8_libbase.host.linux-mips.mk
index fc80e15..f43bc33 100644
--- a/tools/gyp/v8_libbase.host.linux-mips.mk
+++ b/tools/gyp/v8_libbase.host.linux-mips.mk
@@ -74,6 +74,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
@@ -154,6 +155,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
diff --git a/tools/gyp/v8_libbase.host.linux-x86.mk b/tools/gyp/v8_libbase.host.linux-x86.mk
index 7fe4e59..45dfca8 100644
--- a/tools/gyp/v8_libbase.host.linux-x86.mk
+++ b/tools/gyp/v8_libbase.host.linux-x86.mk
@@ -73,6 +73,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
@@ -149,6 +150,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_libbase.host.linux-x86_64.mk b/tools/gyp/v8_libbase.host.linux-x86_64.mk
index c0f7ab1..b97b6e5 100644
--- a/tools/gyp/v8_libbase.host.linux-x86_64.mk
+++ b/tools/gyp/v8_libbase.host.linux-x86_64.mk
@@ -73,6 +73,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
@@ -149,6 +150,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_libbase.target.darwin-arm.mk b/tools/gyp/v8_libbase.target.darwin-arm.mk
index e05bed2..1622462 100644
--- a/tools/gyp/v8_libbase.target.darwin-arm.mk
+++ b/tools/gyp/v8_libbase.target.darwin-arm.mk
@@ -94,6 +94,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
@@ -206,6 +207,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_libbase.target.darwin-arm64.mk b/tools/gyp/v8_libbase.target.darwin-arm64.mk
index 22968d7..5edb048 100644
--- a/tools/gyp/v8_libbase.target.darwin-arm64.mk
+++ b/tools/gyp/v8_libbase.target.darwin-arm64.mk
@@ -84,6 +84,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
@@ -183,6 +184,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_libbase.target.darwin-mips.mk b/tools/gyp/v8_libbase.target.darwin-mips.mk
index c557395..354477e 100644
--- a/tools/gyp/v8_libbase.target.darwin-mips.mk
+++ b/tools/gyp/v8_libbase.target.darwin-mips.mk
@@ -89,6 +89,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
@@ -197,6 +198,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
diff --git a/tools/gyp/v8_libbase.target.darwin-x86.mk b/tools/gyp/v8_libbase.target.darwin-x86.mk
index ba12b49..8ee6ed0 100644
--- a/tools/gyp/v8_libbase.target.darwin-x86.mk
+++ b/tools/gyp/v8_libbase.target.darwin-x86.mk
@@ -89,6 +89,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
@@ -193,6 +194,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_libbase.target.darwin-x86_64.mk b/tools/gyp/v8_libbase.target.darwin-x86_64.mk
index 5abcb45..c376c96 100644
--- a/tools/gyp/v8_libbase.target.darwin-x86_64.mk
+++ b/tools/gyp/v8_libbase.target.darwin-x86_64.mk
@@ -88,6 +88,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
@@ -191,6 +192,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_libbase.target.linux-arm.mk b/tools/gyp/v8_libbase.target.linux-arm.mk
index e05bed2..1622462 100644
--- a/tools/gyp/v8_libbase.target.linux-arm.mk
+++ b/tools/gyp/v8_libbase.target.linux-arm.mk
@@ -94,6 +94,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
@@ -206,6 +207,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_libbase.target.linux-arm64.mk b/tools/gyp/v8_libbase.target.linux-arm64.mk
index 22968d7..5edb048 100644
--- a/tools/gyp/v8_libbase.target.linux-arm64.mk
+++ b/tools/gyp/v8_libbase.target.linux-arm64.mk
@@ -84,6 +84,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
@@ -183,6 +184,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_libbase.target.linux-mips.mk b/tools/gyp/v8_libbase.target.linux-mips.mk
index c557395..354477e 100644
--- a/tools/gyp/v8_libbase.target.linux-mips.mk
+++ b/tools/gyp/v8_libbase.target.linux-mips.mk
@@ -89,6 +89,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
@@ -197,6 +198,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
diff --git a/tools/gyp/v8_libbase.target.linux-x86.mk b/tools/gyp/v8_libbase.target.linux-x86.mk
index ba12b49..8ee6ed0 100644
--- a/tools/gyp/v8_libbase.target.linux-x86.mk
+++ b/tools/gyp/v8_libbase.target.linux-x86.mk
@@ -89,6 +89,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
@@ -193,6 +194,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_libbase.target.linux-x86_64.mk b/tools/gyp/v8_libbase.target.linux-x86_64.mk
index 5abcb45..c376c96 100644
--- a/tools/gyp/v8_libbase.target.linux-x86_64.mk
+++ b/tools/gyp/v8_libbase.target.linux-x86_64.mk
@@ -88,6 +88,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
@@ -191,6 +192,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_nosnapshot.host.darwin-arm.mk b/tools/gyp/v8_nosnapshot.host.darwin-arm.mk
index 0fbe29d..5b51a15 100644
--- a/tools/gyp/v8_nosnapshot.host.darwin-arm.mk
+++ b/tools/gyp/v8_nosnapshot.host.darwin-arm.mk
@@ -83,6 +83,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
@@ -160,6 +161,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_nosnapshot.host.darwin-arm64.mk b/tools/gyp/v8_nosnapshot.host.darwin-arm64.mk
index 80359af..07e9626 100644
--- a/tools/gyp/v8_nosnapshot.host.darwin-arm64.mk
+++ b/tools/gyp/v8_nosnapshot.host.darwin-arm64.mk
@@ -83,6 +83,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
@@ -158,6 +159,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_nosnapshot.host.darwin-mips.mk b/tools/gyp/v8_nosnapshot.host.darwin-mips.mk
index be6d2b5..1c30b52 100644
--- a/tools/gyp/v8_nosnapshot.host.darwin-mips.mk
+++ b/tools/gyp/v8_nosnapshot.host.darwin-mips.mk
@@ -84,6 +84,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
@@ -163,6 +164,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
diff --git a/tools/gyp/v8_nosnapshot.host.darwin-x86.mk b/tools/gyp/v8_nosnapshot.host.darwin-x86.mk
index 59de304..5dc42a5 100644
--- a/tools/gyp/v8_nosnapshot.host.darwin-x86.mk
+++ b/tools/gyp/v8_nosnapshot.host.darwin-x86.mk
@@ -83,6 +83,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
@@ -158,6 +159,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_nosnapshot.host.darwin-x86_64.mk b/tools/gyp/v8_nosnapshot.host.darwin-x86_64.mk
index a8c93b4..3b48330 100644
--- a/tools/gyp/v8_nosnapshot.host.darwin-x86_64.mk
+++ b/tools/gyp/v8_nosnapshot.host.darwin-x86_64.mk
@@ -83,6 +83,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
@@ -158,6 +159,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_nosnapshot.host.linux-arm.mk b/tools/gyp/v8_nosnapshot.host.linux-arm.mk
index b266f4c..5fb3cfa 100644
--- a/tools/gyp/v8_nosnapshot.host.linux-arm.mk
+++ b/tools/gyp/v8_nosnapshot.host.linux-arm.mk
@@ -84,6 +84,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
@@ -162,6 +163,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_nosnapshot.host.linux-arm64.mk b/tools/gyp/v8_nosnapshot.host.linux-arm64.mk
index 9fcae69..63e5afd 100644
--- a/tools/gyp/v8_nosnapshot.host.linux-arm64.mk
+++ b/tools/gyp/v8_nosnapshot.host.linux-arm64.mk
@@ -84,6 +84,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
@@ -160,6 +161,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_nosnapshot.host.linux-mips.mk b/tools/gyp/v8_nosnapshot.host.linux-mips.mk
index 03223f6..6fd58be 100644
--- a/tools/gyp/v8_nosnapshot.host.linux-mips.mk
+++ b/tools/gyp/v8_nosnapshot.host.linux-mips.mk
@@ -85,6 +85,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
@@ -165,6 +166,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
diff --git a/tools/gyp/v8_nosnapshot.host.linux-x86.mk b/tools/gyp/v8_nosnapshot.host.linux-x86.mk
index 635a72a..f425325 100644
--- a/tools/gyp/v8_nosnapshot.host.linux-x86.mk
+++ b/tools/gyp/v8_nosnapshot.host.linux-x86.mk
@@ -84,6 +84,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
@@ -160,6 +161,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_nosnapshot.host.linux-x86_64.mk b/tools/gyp/v8_nosnapshot.host.linux-x86_64.mk
index 3c376e2..cf8988d 100644
--- a/tools/gyp/v8_nosnapshot.host.linux-x86_64.mk
+++ b/tools/gyp/v8_nosnapshot.host.linux-x86_64.mk
@@ -84,6 +84,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
@@ -160,6 +161,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_snapshot.target.darwin-arm.mk b/tools/gyp/v8_snapshot.target.darwin-arm.mk
index 836fa51..199a4b4 100644
--- a/tools/gyp/v8_snapshot.target.darwin-arm.mk
+++ b/tools/gyp/v8_snapshot.target.darwin-arm.mk
@@ -119,6 +119,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
@@ -233,6 +234,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_snapshot.target.darwin-arm64.mk b/tools/gyp/v8_snapshot.target.darwin-arm64.mk
index af5235c..28fa8f3 100644
--- a/tools/gyp/v8_snapshot.target.darwin-arm64.mk
+++ b/tools/gyp/v8_snapshot.target.darwin-arm64.mk
@@ -109,6 +109,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
@@ -210,6 +211,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_snapshot.target.darwin-mips.mk b/tools/gyp/v8_snapshot.target.darwin-mips.mk
index 81a1829..bc76dd1 100644
--- a/tools/gyp/v8_snapshot.target.darwin-mips.mk
+++ b/tools/gyp/v8_snapshot.target.darwin-mips.mk
@@ -114,6 +114,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
@@ -224,6 +225,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
diff --git a/tools/gyp/v8_snapshot.target.darwin-x86.mk b/tools/gyp/v8_snapshot.target.darwin-x86.mk
index e7aa37b..d89b4c4 100644
--- a/tools/gyp/v8_snapshot.target.darwin-x86.mk
+++ b/tools/gyp/v8_snapshot.target.darwin-x86.mk
@@ -114,6 +114,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
@@ -220,6 +221,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_snapshot.target.darwin-x86_64.mk b/tools/gyp/v8_snapshot.target.darwin-x86_64.mk
index 7f74b15..4355284 100644
--- a/tools/gyp/v8_snapshot.target.darwin-x86_64.mk
+++ b/tools/gyp/v8_snapshot.target.darwin-x86_64.mk
@@ -113,6 +113,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
@@ -218,6 +219,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_snapshot.target.linux-arm.mk b/tools/gyp/v8_snapshot.target.linux-arm.mk
index 836fa51..199a4b4 100644
--- a/tools/gyp/v8_snapshot.target.linux-arm.mk
+++ b/tools/gyp/v8_snapshot.target.linux-arm.mk
@@ -119,6 +119,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
@@ -233,6 +234,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_snapshot.target.linux-arm64.mk b/tools/gyp/v8_snapshot.target.linux-arm64.mk
index af5235c..28fa8f3 100644
--- a/tools/gyp/v8_snapshot.target.linux-arm64.mk
+++ b/tools/gyp/v8_snapshot.target.linux-arm64.mk
@@ -109,6 +109,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
@@ -210,6 +211,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_ARM64' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_snapshot.target.linux-mips.mk b/tools/gyp/v8_snapshot.target.linux-mips.mk
index 81a1829..bc76dd1 100644
--- a/tools/gyp/v8_snapshot.target.linux-mips.mk
+++ b/tools/gyp/v8_snapshot.target.linux-mips.mk
@@ -114,6 +114,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
@@ -224,6 +225,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_MIPS' \
 	'-DCAN_USE_FPU_INSTRUCTIONS' \
diff --git a/tools/gyp/v8_snapshot.target.linux-x86.mk b/tools/gyp/v8_snapshot.target.linux-x86.mk
index e7aa37b..d89b4c4 100644
--- a/tools/gyp/v8_snapshot.target.linux-x86.mk
+++ b/tools/gyp/v8_snapshot.target.linux-x86.mk
@@ -114,6 +114,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
@@ -220,6 +221,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_IA32' \
 	'-DV8_I18N_SUPPORT' \
diff --git a/tools/gyp/v8_snapshot.target.linux-x86_64.mk b/tools/gyp/v8_snapshot.target.linux-x86_64.mk
index 7f74b15..4355284 100644
--- a/tools/gyp/v8_snapshot.target.linux-x86_64.mk
+++ b/tools/gyp/v8_snapshot.target.linux-x86_64.mk
@@ -113,6 +113,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \
@@ -218,6 +219,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DV8_TARGET_ARCH_X64' \
 	'-DV8_I18N_SUPPORT' \