Add X86 device support to chromium prebuilt

Change-Id: Idb957af4d206b7d861fa2963edf201a62179f99c
diff --git a/tools/chromium_prebuilt.sh b/tools/chromium_prebuilt.sh
index 4e2159b..a157ab2 100755
--- a/tools/chromium_prebuilt.sh
+++ b/tools/chromium_prebuilt.sh
@@ -35,6 +35,10 @@
     ARCH=arm64
 fi
 
+if [[ $ANDROID_PROMPT_PREFIX == *x86* ]]; then
+    ARCH=x86
+fi
+
 TARGET_DIR=$OUT
 LIBS_64=$TARGET_DIR/system/lib64
 PREBUILT_DIR=$TOP/prebuilts/chromium/$DEVICE
@@ -110,6 +114,11 @@
 \$(shell cp -r \$(LOCAL_PATH)/app/webview/lib/arm64/libwebviewchromium.so out/target/product/__DEVICE__/system/app/webview/lib/arm64/libwebviewchromium.so)
 endif
 
+ifeq (\$(ARCH),x86)
+\$(shell mkdir -p out/target/product/__DEVICE__/system/app/webview/lib/x86/)
+\$(shell cp -r \$(LOCAL_PATH)/app/webview/lib/x86/libwebviewchromium.so out/target/product/__DEVICE__/system/app/webview/lib/x86/libwebviewchromium.so)
+endif
+
 EOF
 
 echo "Done!"