[WebView] Repack the .pak files for all the locales.

android_webview/apk/system_webview_apk_common.gypi

 # 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.
 #
 # When making changes remember that this is shared with the internal .apk
 # build rules.
 {
   'type': 'none',
   'dependencies': [
     '<(DEPTH)/android_webview/android_webview.gyp:libwebviewchromium',
     '<(DEPTH)/android_webview/android_webview.gyp:android_webview_java',
     '<(DEPTH)/android_webview/android_webview.gyp:android_webview_pak',
   ],
   'variables': {
     'native_lib_target': 'libwebviewchromium',
     'never_lint': 1,
     'R_package': 'com.android.webview.chromium',
     'R_package_relpath': 'com/android/webview/chromium',
     'extensions_to_not_compress': 'pak,bin,dat',
     'asset_location': '<(INTERMEDIATE_DIR)/assets/',
     # TODO: crbug.com/442348 Update proguard.flags and re-enable.
     'proguard_enabled': 'false',
     'proguard_flags_paths': ['<(DEPTH)/android_webview/apk/java/proguard.flags'],
+    'android_locales_input_paks_folder': '<(PRODUCT_DIR)/android_webview_assets/',
+    'android_locales_output_paks_folder': '<(asset_location)',
     # TODO: crbug.com/405035 Find a better solution for WebView .pak files.
     'additional_input_paths': [
+      '<@(android_locales_output_paks)',
       '<(asset_location)/webviewchromium.pak',
-      '<(asset_location)/en-US.pak',
       '<(asset_location)/webview_licenses.notice',
     ],
     'conditions': [
       ['icu_use_data_file_flag==1', {
         'additional_input_paths': [
           '<(asset_location)/icudtl.dat',
         ],
       }],
       ['v8_use_external_startup_data==1', {
         'additional_input_paths': [
           '<(asset_location)/natives_blob.bin',
           '<(asset_location)/snapshot_blob.bin',
         ],
       }],
     ],
   },
   'copies': [
     {
       'destination': '<(asset_location)',
       'files': [
+        '<@(android_locales_input_paks)',
         '<(PRODUCT_DIR)/android_webview_assets/webviewchromium.pak',
-        '<(PRODUCT_DIR)/android_webview_assets/en-US.pak',
       ],
       'conditions': [
         ['icu_use_data_file_flag==1', {
           'files': [
             '<(PRODUCT_DIR)/icudtl.dat',
           ],
         }],
         ['v8_use_external_startup_data==1', {
           'files': [
             '<(PRODUCT_DIR)/natives_blob.bin',
@@ skipping 16 matching lines @@
       ],
       'action': [
         'python',
         '<(DEPTH)/android_webview/tools/webview_licenses.py',
         'notice',
         '<(asset_location)/webview_licenses.notice',
       ],
       'message': 'Generating WebView license notice',
     },
   ],
-  'includes': [ '../../build/java_apk.gypi' ],
+  'includes': [
+    '../../build/java_apk.gypi',
+    '../../content/android_locales_paks.gypi',
+  ],
 }