Adding menu item to take screenshot

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 107 matching lines @@
       'browser/ui/bookmarks/bookmark_bar_instructions_delegate.h',
       'browser/ui/bookmarks/bookmark_bubble_delegate.h',
       'browser/ui/bookmarks/bookmark_editor.cc',
       'browser/ui/bookmarks/bookmark_editor.h',
       'browser/ui/bookmarks/bookmark_tab_helper.cc',
       'browser/ui/bookmarks/bookmark_tab_helper.h',
       'browser/ui/bookmarks/bookmark_utils.cc',
       'browser/ui/bookmarks/bookmark_utils.h',
       'browser/ui/bookmarks/recently_used_folders_combo_model.cc',
       'browser/ui/bookmarks/recently_used_folders_combo_model.h',
+      'browser/ui/browser_commands_chromeos.cc',
+      'browser/ui/browser_commands_chromeos.h',
       'browser/ui/browser_commands_mac.cc',
       'browser/ui/browser_commands_mac.h',
       'browser/ui/browser_content_translate_driver_observer.cc',
       'browser/ui/browser_content_translate_driver_observer.h',
       'browser/ui/browser_dialogs.h',
       'browser/ui/browser_instant_controller.cc',
       'browser/ui/browser_instant_controller.h',
       'browser/ui/browser_mac.cc',
       'browser/ui/browser_mac.h',
       'browser/ui/browser_navigator.cc',
@@ skipping 2977 matching lines @@
           ],
           'sources': [
             '<@(chrome_browser_ui_non_mobile_sources)',
             '<@(chrome_browser_ui_omnibox_non_mobile_sources)',
           ],
         }],
       ],
     },
   ],
 }