Create chrome://device-emulator and add the ability to get a battery percentage and send an updated…

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 290 matching lines @@
       'browser/ui/webui/chromeos/certificate_manager_dialog_ui.cc',
       'browser/ui/webui/chromeos/certificate_manager_dialog_ui.h',
       'browser/ui/webui/chromeos/choose_mobile_network_ui.cc',
       'browser/ui/webui/chromeos/choose_mobile_network_ui.h',
       'browser/ui/webui/chromeos/cryptohome_ui.cc',
       'browser/ui/webui/chromeos/cryptohome_ui.h',
       'browser/ui/webui/chromeos/cryptohome_web_ui_handler.cc',
       'browser/ui/webui/chromeos/cryptohome_web_ui_handler.h',
       'browser/ui/webui/chromeos/drive_internals_ui.cc',
       'browser/ui/webui/chromeos/drive_internals_ui.h',
+      'browser/ui/webui/chromeos/emulator/device_emulator_message_handler.cc',
+      'browser/ui/webui/chromeos/emulator/device_emulator_message_handler.h',
+      'browser/ui/webui/chromeos/emulator/device_emulator_ui.cc',
+      'browser/ui/webui/chromeos/emulator/device_emulator_ui.h',
       'browser/ui/webui/chromeos/first_run/first_run_actor.cc',
       'browser/ui/webui/chromeos/first_run/first_run_actor.h',
       'browser/ui/webui/chromeos/first_run/first_run_handler.cc',
       'browser/ui/webui/chromeos/first_run/first_run_handler.h',
       'browser/ui/webui/chromeos/first_run/first_run_ui.cc',
       'browser/ui/webui/chromeos/first_run/first_run_ui.h',
       'browser/ui/webui/chromeos/image_source.cc',
       'browser/ui/webui/chromeos/image_source.h',
       'browser/ui/webui/chromeos/imageburner/imageburner_ui.cc',
       'browser/ui/webui/chromeos/imageburner/imageburner_ui.h',
@@ skipping 2879 matching lines @@
           ],
           'sources': [
             '<@(chrome_browser_ui_non_mobile_sources)',
             '<@(chrome_browser_ui_omnibox_non_mobile_sources)',
           ],
         }],
       ],
     },
   ],
 }