Enable FIFO scheduling for UI and render threads by default

bug: 24503801
Test: ran UI and app startup tests and saw perf/Watt improvements
Change-Id: I2edfa2b015e1ff1328d5047d606deb9854feacb4
diff --git a/device-common.mk b/device-common.mk
index 81e9586..47d7a30 100644
--- a/device-common.mk
+++ b/device-common.mk
@@ -60,6 +60,10 @@
 PRODUCT_PROPERTY_OVERRIDES += \
     ro.opengles.version=196610
 
+# enable FIFO scheduling for UI and Render threads by default
+PRODUCT_PROPERTY_OVERRIDES += \
+    sys.use_fifo_ui=1
+
 # HWUI common settings
 PRODUCT_PROPERTY_OVERRIDES += \
     ro.hwui.gradient_cache_size=1 \