android: Check that we do not include the same resource in multiple pak files.

chrome/chrome_android_paks.gypi

 # Copyright (c) 2012 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': {
     'chrome_android_pak_output_folder': '<@(PRODUCT_DIR)/../assets/<(package_name)',
-    'chrome_android_pak_input_resources': [
+    'chrome_android_pak_unique_resources': [
       '<(PRODUCT_DIR)/resources.pak',
       '<(PRODUCT_DIR)/chrome_100_percent.pak',
+    ],
+    'chrome_android_pak_language_resources': [
       '<(PRODUCT_DIR)/locales/am.pak',
       '<(PRODUCT_DIR)/locales/ar.pak',
       '<(PRODUCT_DIR)/locales/bg.pak',
       '<(PRODUCT_DIR)/locales/ca.pak',
       '<(PRODUCT_DIR)/locales/cs.pak',
       '<(PRODUCT_DIR)/locales/da.pak',
       '<(PRODUCT_DIR)/locales/de.pak',
       '<(PRODUCT_DIR)/locales/el.pak',
       '<(PRODUCT_DIR)/locales/en-GB.pak',
       '<(PRODUCT_DIR)/locales/en-US.pak',
@@ skipping 25 matching lines @@
       '<(PRODUCT_DIR)/locales/sr.pak',
       '<(PRODUCT_DIR)/locales/sv.pak',
       '<(PRODUCT_DIR)/locales/sw.pak',
       '<(PRODUCT_DIR)/locales/th.pak',
       '<(PRODUCT_DIR)/locales/tr.pak',
       '<(PRODUCT_DIR)/locales/uk.pak',
       '<(PRODUCT_DIR)/locales/vi.pak',
       '<(PRODUCT_DIR)/locales/zh-CN.pak',
       '<(PRODUCT_DIR)/locales/zh-TW.pak',
     ],
+    'chrome_android_pak_input_resources': [
+      '<@(chrome_android_pak_language_resources)',
+      '<@(chrome_android_pak_unique_resources)',
+    ],
     'chrome_android_pak_output_resources': [
       '<(chrome_android_pak_output_folder)/resources.pak',
       '<(chrome_android_pak_output_folder)/chrome_100_percent.pak',
       '<(chrome_android_pak_output_folder)/am.pak',
       '<(chrome_android_pak_output_folder)/ar.pak',
       '<(chrome_android_pak_output_folder)/bg.pak',
       '<(chrome_android_pak_output_folder)/ca.pak',
       '<(chrome_android_pak_output_folder)/cs.pak',
       '<(chrome_android_pak_output_folder)/da.pak',
       '<(chrome_android_pak_output_folder)/de.pak',
@@ skipping 57 matching lines @@
     ],
   },
   'targets': [
     {
       'target_name': 'chrome_android_paks_copy',
       'type': 'none',
       'dependencies': [
         '<(DEPTH)/chrome/chrome_resources.gyp:packed_resources',
         '<(DEPTH)/chrome/chrome_resources.gyp:packed_extra_resources',
       ],
+      'actions': [{
+        'action_name': 'check for duplicate resources',
+        'inputs': [ '<@(chrome_android_pak_unique_resources)', ],
+        'outputs': [ '<(PRODUCT_DIR)/check_dups_<(package_name).stamp' ],
+        'action': [
+            'python',
+            '<(DEPTH)/tools/grit/grit/format/check_dups.py',
+            '<@(chrome_android_pak_unique_resources)',
+        ],
+      }],
       'copies': [
         {
           'destination': '<(chrome_android_pak_output_folder)',
           'files': [
             '<@(chrome_android_pak_input_resources)',
           ],
         }
       ],
     },
   ],
 }