Allow chrome_shell_paks target to be reused

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': [
       '<(PRODUCT_DIR)/resources.pak',
       '<(PRODUCT_DIR)/chrome_100_percent.pak',
       '<(PRODUCT_DIR)/locales/am.pak',
@@ skipping 103 matching lines @@
           '<(PRODUCT_DIR)/natives_blob.bin',
           '<(PRODUCT_DIR)/snapshot_blob.bin',
         ],
         'chrome_android_pak_output_resources': [
           '<(chrome_android_pak_output_folder)/natives_blob.bin',
           '<(chrome_android_pak_output_folder)/snapshot_blob.bin',
         ],
       }],
     ],
   },
+  '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',
+      ],
+      'copies': [
+        {
+          'destination': '<(chrome_android_pak_output_folder)',
+          'files': [
+            '<@(chrome_android_pak_input_resources)',
+          ],
+        }
+      ],
+    },
+  ],
 }