Mirror images for RTL languages at build time.

ui/android/ui_android.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
       'target_name': 'window_open_disposition_java',
       'type': 'none',
       'sources': [
         'java/WindowOpenDisposition.template',
       ],
       'variables': {
         'package_name': 'org/chromium/ui',
         'template_deps': ['../base/window_open_disposition_list.h'],
       },
       'includes': [ '../../build/android/java_cpp_template.gypi' ],
     },
     {
       'target_name': 'ui_java',
       'type': 'none',
       'variables': {
         'java_in_dir': '../../ui/android/java',
         'has_java_resources': 1,
+        'mirror_images': 1,
         'R_package': 'org.chromium.ui',
         'R_package_relpath': 'org/chromium/ui',
         'java_strings_grd': 'android_ui_strings.grd',
       },
       'dependencies': [
         '../../base/base.gyp:base_java',
         'window_open_disposition_java',
       ],
       'includes': [ '../../build/java.gypi' ],
     },
   ],
 }