build full 64bit WebView

build/config/android/config.gni

Index: build/config/android/config.gni
diff --git a/build/config/android/config.gni b/build/config/android/config.gni
index 6a16eb2d68bc82f3c147fcd0ec9e2c2247297525..a36fd3dae6f90b7f4b3b221e60c746b03877e607 100644
--- a/build/config/android/config.gni
+++ b/build/config/android/config.gni
@@ -133,6 +133,10 @@ if (is_android) {
     # Adds intrumentation to each function. Writes a file with the order that
     # functions are called at startup.
     use_order_profiling = false
+
+    # Only build 64-bit binaries in 64-bit WebView APK. 32-bit apps will not be
+    # supported; for development only.
+    build_64bit_only_webview = false

[jbudorick, 2016/09/16 16:23:35]

As this is webview-specific, it seems like it should be handled by a .gni in
android_webview rather than in here.

[Torne, 2016/09/16 16:37:57]

It'll also have an effect on the monochrome APK.

[michaelbai, 2016/09/16 20:05:55]

Since there are 2 separated variable, this one is webview specific, moved it to
android_webview

   }
 
   # We need a second declare_args block to make sure we are using the overridden
@@ -142,6 +146,11 @@ if (is_android) {
     enable_incremental_dx = is_java_debug
   }
 
+  if (defined(merge_64bit_webview_and_monochrome) &&

[jbudorick, 2016/09/16 16:23:35]

I agree with torne -- this should be defined upstream.

+      merge_64bit_webview_and_monochrome) {
+    build_64bit_only_webview = true
+  }
+
   # Neither of these should ever be used for release builds since they are
   # somewhat experimental and dx --incremental is known to not produce
   # byte-for-byte identical output.