Enable external V8 snapshot on Android through GN.

build/config/features.gni

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This file contains UI-related build flags. It should theoretically be in the
 # src/ui directory and only things that depend on the ui module should get the
 # definitions.
 #
 # However, today we have many "bad" dependencies on some of these flags from,
 # e.g. base, so they need to be global.
@@ skipping 21 matching lines @@
   # --debug-devtools cmdline switch.
   debug_devtools = false
 
   # Enables WebRTC.
   #enable_webrtc = !is_ios  TODO(GYP) use this condition when WebRTC works in
   #                         the GN build.
   enable_webrtc = false
 
   # Enables proprietary codecs and demuxers; e.g. H264, MOV, AAC, and MP3.
   proprietary_codecs = false
+
+  v8_use_external_startup_data = false

[rmcilroy, 2014/11/24 17:05:25]

Could you move this to a non-declare_args variable (in the set of enable_xxx
below) and set it as follows (see comment above):

#enable_webrtcis_android && !is_android_webview_build TODO(baixo) enable this
once V8 CL lands.
v8_use_external_startup_data = false

[baixo1, 2014/11/24 21:27:10]

Done.

 }
 
 # Additional dependent variables -----------------------------------------------
 
 # Set the version of CLD.
 #   0: Don't specify the version. This option is for the Finch testing.
 #   1: Use only CLD1.
 #   2: Use only CLD2.
 if (is_android) {
   cld_version = 1
@@ skipping 98 matching lines @@
 # ChromeVox, which can then be enabled via a command-line switch.
 enable_chromevox_next = false
 
 # Use brlapi from brltty for braille display support.
 use_brlapi = is_chromeos
 
 # Option controlling the use of GConf (the classic GNOME configuration
 # system).
 # TODO(GYP) also require !embedded to enable.
 use_gconf = is_linux && !is_chromeos