Bring up fast user switcher on right-click of the avatar menu on Mac.

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.
 
 {
   'variables': {
     # There are two sections of sources:
     # * "Platform"-based sources (OS, toolkit, etc.)
     # * Feature/directory-based sources (e.g., history, printing)
 
@@ skipping 609 matching lines @@
       'browser/ui/cocoa/passwords/manage_passwords_bubble_manage_view_controller.mm',
       'browser/ui/cocoa/passwords/manage_passwords_bubble_never_save_view_controller.h',
       'browser/ui/cocoa/passwords/manage_passwords_bubble_never_save_view_controller.mm',
       'browser/ui/cocoa/passwords/manage_passwords_bubble_pending_view_controller.h',
       'browser/ui/cocoa/passwords/manage_passwords_bubble_pending_view_controller.mm',
       'browser/ui/cocoa/pdf_password_dialog_cocoa.mm',
       'browser/ui/cocoa/presentation_mode_controller.h',
       'browser/ui/cocoa/presentation_mode_controller.mm',
       'browser/ui/cocoa/profiles/avatar_base_controller.h',
       'browser/ui/cocoa/profiles/avatar_base_controller.mm',
+      'browser/ui/cocoa/profiles/avatar_button.h',
+      'browser/ui/cocoa/profiles/avatar_button.mm',
       'browser/ui/cocoa/profiles/avatar_button_controller.h',
       'browser/ui/cocoa/profiles/avatar_button_controller.mm',
       'browser/ui/cocoa/profiles/avatar_icon_controller.h',
       'browser/ui/cocoa/profiles/avatar_icon_controller.mm',
       'browser/ui/cocoa/profiles/avatar_label_button.h',
       'browser/ui/cocoa/profiles/avatar_label_button.mm',
       'browser/ui/cocoa/profiles/avatar_menu_bubble_controller.h',
       'browser/ui/cocoa/profiles/avatar_menu_bubble_controller.mm',
       'browser/ui/cocoa/profiles/profile_chooser_controller.h',
       'browser/ui/cocoa/profiles/profile_chooser_controller.mm',
@@ skipping 2483 matching lines @@
           ],
           'sources': [
             '<@(chrome_browser_ui_non_mobile_sources)',
             '<@(chrome_browser_ui_omnibox_non_mobile_sources)',
           ],
         }],
       ],
     },
   ],
 }