[Mac]Implement ViewID support. (third approach)

chrome/chrome_browser.gypi

 # Copyright (c) 2010 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': '<(library)',
       'msvs_guid': '5BF908A7-68FB-4A4B-99E3-8C749F1FE4EA',
@@ skipping 983 matching lines @@
         'browser/cocoa/translate/translate_infobar_base.h',
         'browser/cocoa/translate/translate_infobar_base.mm',
         'browser/cocoa/translate/translate_message_infobar_controller.h',
         'browser/cocoa/translate/translate_message_infobar_controller.mm',
         'browser/cocoa/ui_localizer.h',
         'browser/cocoa/ui_localizer.mm',
         'browser/cocoa/url_drop_target.h',
         'browser/cocoa/url_drop_target.mm',
         'browser/cocoa/vertical_gradient_view.h',
         'browser/cocoa/vertical_gradient_view.mm',
+        'browser/cocoa/view_id_util.h',
+        'browser/cocoa/view_id_util.mm',
         'browser/cocoa/view_resizer.h',
         'browser/cocoa/web_contents_drag_source.h',
         'browser/cocoa/web_contents_drag_source.mm',
         'browser/cocoa/web_drag_source.h',
         'browser/cocoa/web_drag_source.mm',
         'browser/cocoa/web_drop_target.h',
         'browser/cocoa/web_drop_target.mm',
         'browser/cocoa/window_size_autosaver.h',
         'browser/cocoa/window_size_autosaver.mm',
         'browser/cocoa/wrench_menu_controller.h',
@@ skipping 2636 matching lines @@
       ],
     },
   ],
 }
 
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