chromeos: Add support for the battery status API on chromeos.

content/content_common.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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../build/temp_gyp/googleurl.gyp:googleurl',
     '../gpu/gpu.gyp:gles2_implementation',
     '../gpu/gpu.gyp:gpu_ipc',
@@ skipping 78 matching lines @@
     'public/common/url_fetcher_delegate.h',
     'public/common/url_fetcher_factory.h',
     'public/common/view_type.h',
     'public/common/zygote_fork_delegate_linux.h',
     'common/accessibility_messages.h',
     'common/appcache/appcache_backend_proxy.cc',
     'common/appcache/appcache_backend_proxy.h',
     'common/appcache/appcache_dispatcher.cc',
     'common/appcache/appcache_dispatcher.h',
     'common/appcache_messages.h',
+    'common/battery_status_messages.h',
     'common/browser_plugin_messages.h',
     'common/child_process.cc',
     'common/child_process.h',
     'common/child_process_host_impl.cc',
     'common/child_process_host_impl.h',
     'common/child_process_messages.h',
     'common/child_process_sandbox_support_impl_linux.cc',
     'common/child_process_sandbox_support_impl_linux.h',
     'common/child_process_sandbox_support_impl_shm_linux.cc',
     'common/child_thread.cc',
@@ skipping 329 matching lines @@
         '../build/extract_from_cab.py',
         '..\\third_party\\directxsdk\\files\\Redist\\<(input)',
         '<(output)',
         '<(PRODUCT_DIR)',
         ],
       },
      ]
     }]
   ],
 }