Add webviewchromium to the preopt jar list.

The default BOOTCLASSPATH now includes webviewchromium.jar, so also add
it to the dex_preopt list.

Change-Id: I67b87cb0bf997c74596c276314a5196f8cf0d1b4
diff --git a/core/dex_preopt.mk b/core/dex_preopt.mk
index 0c9904a..8b2c868 100644
--- a/core/dex_preopt.mk
+++ b/core/dex_preopt.mk
@@ -4,7 +4,7 @@
 ####################################
 
 # TODO: replace it with device's BOOTCLASSPATH
-DEXPREOPT_BOOT_JARS := core:conscrypt:okhttp:core-junit:bouncycastle:ext:framework:telephony-common:voip-common:mms-common:android.policy:services:apache-xml
+DEXPREOPT_BOOT_JARS := core:conscrypt:okhttp:core-junit:bouncycastle:ext:framework:telephony-common:voip-common:mms-common:android.policy:services:apache-xml:webviewchromium
 DEXPREOPT_BOOT_JARS_MODULES := $(subst :, ,$(DEXPREOPT_BOOT_JARS))
 
 DEXPREOPT_BUILD_DIR := $(OUT_DIR)