Add support for the audio-output-device switching IPC mechanism to the renderer lower layers (media…

content/renderer/media/audio_message_filter.h

Index: content/renderer/media/audio_message_filter.h
diff --git a/content/renderer/media/audio_message_filter.h b/content/renderer/media/audio_message_filter.h
index f98b7d6983d54765b71bee03bd72fe16853d8828..ea84b64964aa88a7849a1796be0f9d1660bc94f5 100644
--- a/content/renderer/media/audio_message_filter.h
+++ b/content/renderer/media/audio_message_filter.h
@@ -76,6 +76,12 @@ class CONTENT_EXPORT AudioMessageFilter : public IPC::MessageFilter {
   void OnStreamStateChanged(int stream_id,
                             media::AudioOutputIPCDelegateState state);
 
+  // Received when the browser process has finished processing a
+  // SwitchOutputDevice request
+  void OnOutputDeviceSwitched(int stream_id,
+                              int request_id,
+                              media::SwitchOutputDeviceResult result);
+
   // IPC sender for Send(); must only be accesed on |io_task_runner_|.
   IPC::Sender* sender_;