[Mac] Implement the basic zoom bubble.

chrome/chrome_browser_ui.gypi

 # Copyright 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_ui',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 378 matching lines @@
         'browser/ui/cocoa/bookmarks/bookmark_tree_browser_cell.h',
         'browser/ui/cocoa/bookmarks/bookmark_tree_browser_cell.mm',
         'browser/ui/cocoa/browser/avatar_button_controller.h',
         'browser/ui/cocoa/browser/avatar_button_controller.mm',
         'browser/ui/cocoa/browser/avatar_menu_bubble_controller.h',
         'browser/ui/cocoa/browser/avatar_menu_bubble_controller.mm',
         'browser/ui/cocoa/browser/edit_search_engine_cocoa_controller.h',
         'browser/ui/cocoa/browser/edit_search_engine_cocoa_controller.mm',
         'browser/ui/cocoa/browser/password_generation_bubble_controller.h',
         'browser/ui/cocoa/browser/password_generation_bubble_controller.mm',
+        'browser/ui/cocoa/browser/zoom_bubble_controller.h',
+        'browser/ui/cocoa/browser/zoom_bubble_controller.mm',
         'browser/ui/cocoa/browser_command_executor.h',
         'browser/ui/cocoa/browser_window_cocoa.h',
         'browser/ui/cocoa/browser_window_cocoa.mm',
         'browser/ui/cocoa/browser_window_controller.h',
         'browser/ui/cocoa/browser_window_controller.mm',
         'browser/ui/cocoa/browser_window_controller_private.h',
         'browser/ui/cocoa/browser_window_controller_private.mm',
         'browser/ui/cocoa/browser_window_factory.mm',
         'browser/ui/cocoa/browser_window_utils.h',
         'browser/ui/cocoa/browser_window_utils.mm',
@@ skipping 2389 matching lines @@
         }],
         ['enable_message_center==1', {
           'dependencies': [
             '../ui/message_center/message_center.gyp:message_center',
           ],
         }],
       ],
     },
   ],
 }