Monitor the IO message loop in the AudioDevice classes.

content/content_renderer.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': [
     '../jingle/jingle.gyp:jingle_glue',
     '../net/net.gyp:net',
     '../ppapi/ppapi_internal.gyp:ppapi_proxy',
     '../ppapi/ppapi_internal.gyp:ppapi_shared',
@@ skipping 107 matching lines @@
     'renderer/media/render_audiosourceprovider.cc',
     'renderer/media/render_audiosourceprovider.h',
     'renderer/media/render_media_log.cc',
     'renderer/media/render_media_log.h',
     'renderer/media/renderer_gpu_video_decoder_factories.cc',
     'renderer/media/renderer_gpu_video_decoder_factories.h',
     'renderer/media/renderer_webaudiodevice_impl.cc',
     'renderer/media/renderer_webaudiodevice_impl.h',
     'renderer/media/rtc_video_decoder.cc',
     'renderer/media/rtc_video_decoder.h',
+    'renderer/media/scoped_loop_observer.cc',
+    'renderer/media/scoped_loop_observer.h',
     'renderer/media/video_capture_impl.cc',
     'renderer/media/video_capture_impl.h',
     'renderer/media/video_capture_impl_manager.cc',
     'renderer/media/video_capture_impl_manager.h',
     'renderer/media/video_capture_message_filter.cc',
     'renderer/media/video_capture_message_filter.h',
     'renderer/mhtml_generator.cc',
     'renderer/mhtml_generator.h',
     'renderer/mouse_lock_dispatcher.cc',
     'renderer/mouse_lock_dispatcher.h',
@@ skipping 161 matching lines @@
     }, {
       'sources!': [
         'renderer/java/java_bridge_channel.cc',
         'renderer/java/java_bridge_channel.h',
         'renderer/java/java_bridge_dispatcher.cc',
         'renderer/java/java_bridge_dispatcher.h',
       ],
     }],
   ],
 }