[chromeos] Add an about:power UI.

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 2244 matching lines @@
         'browser/ui/webui/chromeos/login/user_image_screen_handler.cc',
         'browser/ui/webui/chromeos/login/user_image_screen_handler.h',
         'browser/ui/webui/chromeos/login/wrong_hwid_screen_handler.cc',
         'browser/ui/webui/chromeos/login/wrong_hwid_screen_handler.h',
         'browser/ui/webui/chromeos/mobile_setup_dialog.cc',
         'browser/ui/webui/chromeos/mobile_setup_dialog.h',
         'browser/ui/webui/chromeos/mobile_setup_ui.cc',
         'browser/ui/webui/chromeos/mobile_setup_ui.h',
         'browser/ui/webui/chromeos/network_ui.cc',
         'browser/ui/webui/chromeos/network_ui.h',
+        'browser/ui/webui/chromeos/power_ui.cc',
+        'browser/ui/webui/chromeos/power_ui.h',
         'browser/ui/webui/chromeos/proxy_settings_ui.cc',
         'browser/ui/webui/chromeos/proxy_settings_ui.h',
         'browser/ui/webui/chromeos/sim_unlock_ui.cc',
         'browser/ui/webui/chromeos/sim_unlock_ui.h',
         'browser/ui/webui/chromeos/slow_trace_ui.cc',
         'browser/ui/webui/chromeos/slow_trace_ui.h',
         'browser/ui/webui/chromeos/slow_ui.cc',
         'browser/ui/webui/chromeos/slow_ui.h',
         'browser/ui/webui/chromeos/ui_account_tweaks.cc',
         'browser/ui/webui/chromeos/ui_account_tweaks.h',
@@ skipping 1077 matching lines @@
             'browser/ui/webui/local_discovery/local_discovery_ui.cc',
             'browser/ui/webui/local_discovery/local_discovery_ui.h',
             'browser/ui/webui/local_discovery/local_discovery_ui_handler.cc',
             'browser/ui/webui/local_discovery/local_discovery_ui_handler.h',
           ],
         }],
       ],
     },
   ],
 }