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 36ec380f8db91f4bfdfd5bf6e768ce1d9fa4b425..bb346d8e631e0b5927139505355558aaffc5596e 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::AudioOutputIPCDelegate::State 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_;