chromeos: Add support for dimming the screen.

chrome/chrome_browser.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 775 matching lines @@
         'browser/chromeos/power/low_battery_observer.cc',
         'browser/chromeos/power/low_battery_observer.h',
         'browser/chromeos/power/power_button_controller_delegate_chromeos.cc',
         'browser/chromeos/power/power_button_controller_delegate_chromeos.h',
         'browser/chromeos/power/power_button_observer.cc',
         'browser/chromeos/power/power_button_observer.h',
         'browser/chromeos/power/power_state_override.cc',
         'browser/chromeos/power/power_state_override.h',
         'browser/chromeos/power/resume_observer.cc',
         'browser/chromeos/power/resume_observer.h',
+        'browser/chromeos/power/screen_dimming_observer.cc',
+        'browser/chromeos/power/screen_dimming_observer.h',
         'browser/chromeos/power/screen_lock_observer.cc',
         'browser/chromeos/power/screen_lock_observer.h',
         'browser/chromeos/power/video_property_writer.cc',
         'browser/chromeos/power/video_property_writer.h',
         'browser/chromeos/preferences.cc',
         'browser/chromeos/preferences.h',
         'browser/chromeos/prerender_condition_network.cc',
         'browser/chromeos/prerender_condition_network.h',
         'browser/chromeos/process_proxy/process_output_watcher.cc',
         'browser/chromeos/process_proxy/process_output_watcher.h',
@@ skipping 4441 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/chromeos/gdata/gdata.proto' ],
       'variables': {
         'proto_in_dir': 'browser/chromeos/gdata',
         'proto_out_dir': 'chrome/browser/chromeos/gdata',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }