Motown: Define MediaRenderer and make it the way we identify renderers.

services/media/audio/audio_server_impl.h

 // Copyright 2015 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.
 
 #ifndef SERVICES_MEDIA_AUDIO_AUDIO_SERVER_IMPL_H_
 #define SERVICES_MEDIA_AUDIO_AUDIO_SERVER_IMPL_H_
 
 #include <list>
 #include <set>
 
@@ skipping 11 matching lines @@
 namespace audio {
 
 class AudioServerImpl : public AudioServer {
  public:
   AudioServerImpl();
   ~AudioServerImpl() override;
 
   void Initialize();
 
   // AudioServer
-  void CreateTrack(mojo::InterfaceRequest<AudioTrack> track) override;
+  void CreateTrack(InterfaceRequest<AudioTrack> track,
+      InterfaceRequest<MediaRenderer> renderer) override;
 
   // Called (indirectly) by AudioOutputs to schedule the callback for a
   // MediaPacked which was queued to an AudioTrack via. a media pipe.
   //
   // TODO(johngro): This bouncing through thread contexts is inefficient and
   // will increase the latency requirements for clients (its going to take them
   // some extra time to discover that their media has been completely consumed).
   // When mojo exposes a way to safely invoke interface method callbacks from
   // threads other than the thread which executed the method itself, we will
   // want to switch to creating the callback message directly, instead of
@@ skipping 41 matching lines @@
   bool cleanup_scheduled_ = false;
   bool shutting_down_ = false;
   base::Closure cleanup_closure_;
 };
 
 }  // namespace audio
 }  // namespace media
 }  // namespace mojo
 
 #endif  // SERVICES_MEDIA_AUDIO_AUDIO_SERVER_IMPL_H_