Part 1: Plumb render view ID to render host

media/audio/audio_output_ipc.h

Index: media/audio/audio_output_ipc.h
diff --git a/media/audio/audio_output_ipc.h b/media/audio/audio_output_ipc.h
index 7f9df3bf949093d9ee80b01982d57340f3a0a0ca..47f061082075070114fe86ac565f59daa2a4b252 100644
--- a/media/audio/audio_output_ipc.h
+++ b/media/audio/audio_output_ipc.h
@@ -57,6 +57,8 @@ class MEDIA_EXPORT AudioOutputIPCDelegate {
 // process.
 class MEDIA_EXPORT AudioOutputIPC {
  public:
+  virtual ~AudioOutputIPC();
+
   // Registers an AudioOutputIPCDelegate and returns a |stream_id| that must
   // be used with all other IPC functions in this interface.
   virtual int AddDelegate(AudioOutputIPCDelegate* delegate) = 0;
@@ -93,9 +95,6 @@ class MEDIA_EXPORT AudioOutputIPC {
 
   // Sets the volume of the audio stream.
   virtual void SetVolume(int stream_id, double volume) = 0;
-
- protected:
-  virtual ~AudioOutputIPC();
 };
 
 }  // namespace media