Enable external V8 snapshot on Android through GN.

chrome/android/BUILD.gn

 # 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//chrome/version.gni")
 import("//third_party/icu/config.gni")
 import("channel.gni")
 
@@ skipping 299 matching lines @@
   deps = [
     "//chrome:packed_resources",
     "//chrome:packed_extra_resources",
   ]
 
   if (icu_use_data_file) {
     sources += [
       "$root_build_dir/icudtl.dat"
     ]
   }
+  if (v8_use_external_startup_data) {
+    sources += [
+      "$root_gen_dir/natives_blob.bin",
+      "$root_gen_dir/snapshot_blob.bin",
+    ]
+  }
 }
 
 chrome_shell_manifest = "$target_gen_dir/chrome_shell_manifest/AndroidManifest.xml"
 
 # GYP: //chrome/chrome_shell.gypi:chrome_shell_manifest
 jinja_template("chrome_shell_manifest") {
   testonly = true
   input = "shell/java/AndroidManifest.xml"
   output = chrome_shell_manifest
 }
@@ skipping 147 matching lines @@
   source = "java/ChromeVersionConstants.java.version"
   output = chrome_version_java_file
   extra_args = ["-e", "CHANNEL=str.upper('$android_channel')"]
 }
 
 zip("chrome_version_srcjar") {
   inputs = [ chrome_version_java_file ]
   output = "$target_gen_dir/$target_name.srcjar"
   base_dir = chrome_version_java_dir
 }