Add shortcuts for keyboard brightness

ash/ash.gyp

 # 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': {
     'chromium_code': 1,
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
   },
 
@@ skipping 126 matching lines @@
         'system/date/date_view.cc',
         'system/date/date_view.h',
         'system/date/tray_date.cc',
         'system/date/tray_date.h',
         'system/drive/drive_observer.h',
         'system/drive/tray_drive.cc',
         'system/drive/tray_drive.h',
         'system/ime/ime_observer.h',
         'system/ime/tray_ime.cc',
         'system/ime/tray_ime.h',
+        'system/keyboard_brightness/keyboard_brightness_control_delegate.h',
         'system/locale/tray_locale.cc',
         'system/locale/tray_locale.h',
         'system/network/network_observer.h',
         'system/network/tray_network.cc',
         'system/network/tray_network.h',
         'system/network/tray_sms.cc',
         'system/network/tray_sms.h',
         'system/power/power_status_observer.h',
         'system/power/power_status_view.cc',
         'system/power/power_status_view.h',
@@ skipping 411 matching lines @@
             'shell/cocoa/app-Info.plist',
           ],
           'xcode_settings': {
             'INFOPLIST_FILE': 'shell/cocoa/app-Info.plist',
           },
         }],
       ],
     },
   ],
 }