add device notification to Mac

content/content_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.
 
 {
   'dependencies': [
     'browser/debugger/devtools_resources.gyp:devtools_resources',
     'browser/speech/proto/speech_proto.gyp:speech_proto',
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
@@ skipping 257 matching lines @@
     'browser/debugger/devtools_netlog_observer.cc',
     'browser/debugger/devtools_netlog_observer.h',
     'browser/debugger/render_view_devtools_agent_host.cc',
     'browser/debugger/render_view_devtools_agent_host.h',
     'browser/debugger/worker_devtools_manager.cc',
     'browser/debugger/worker_devtools_manager.h',
     'browser/debugger/worker_devtools_message_filter.cc',
     'browser/debugger/worker_devtools_message_filter.h',
     'browser/device_monitor_linux.cc',
     'browser/device_monitor_linux.h',
+    'browser/device_monitor_mac.cc',
+    'browser/device_monitor_mac.h',
     'browser/device_orientation/accelerometer_mac.cc',
     'browser/device_orientation/accelerometer_mac.h',
     'browser/device_orientation/data_fetcher.h',
     'browser/device_orientation/data_fetcher_impl_android.cc',
     'browser/device_orientation/data_fetcher_impl_android.h',
     'browser/device_orientation/device_data.h',
     'browser/device_orientation/message_filter.cc',
     'browser/device_orientation/message_filter.h',
     'browser/device_orientation/observer_delegate.cc',
     'browser/device_orientation/observer_delegate.h',
@@ skipping 720 matching lines @@
         ['exclude', '^browser/renderer_host/java/'],
       ],
     }],
     ['input_speech==0', {
       'sources/': [
         ['exclude', '^browser/speech/'],
       ],
     }],
   ],
 }