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

services/media/audio/audio_server_impl.cc

 // 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.
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/message_loop/message_loop.h"
 #include "base/task_runner.h"
 
 #include "services/media/audio/audio_output_manager.h"
@@ skipping 40 matching lines @@
     size_t size_before = tracks_.size();
     (*tracks_.begin())->Shutdown();
     size_t size_after = tracks_.size();
     DCHECK_LT(size_after, size_before);
   }
 
   output_manager_.Shutdown();
   DoPacketCleanup();
 }
 
-void AudioServerImpl::CreateTrack(InterfaceRequest<AudioTrack> track) {
-  tracks_.insert(AudioTrackImpl::Create(track.Pass(), this));
+void AudioServerImpl::CreateTrack(InterfaceRequest<AudioTrack> track,
+    InterfaceRequest<MediaRenderer> renderer) {
+  tracks_.insert(AudioTrackImpl::Create(track.Pass(), renderer.Pass(), this));
 }
 
 void AudioServerImpl::DoPacketCleanup() {
   // In order to minimize the time we spend in the lock, we allocate a new
   // queue, then lock, swap and clear the sched flag, and finally clean out the
   // queue (which has the side effect of triggering all of the send packet
   // callbacks).
   //
   // Note: this is only safe because we know that we are executing on a single
   // threaded task runner.  Without this guarantee, it might be possible call
@@ skipping 32 matching lines @@
   if (!cleanup_scheduled_ && !shutting_down_) {
     DCHECK(task_runner_);
     cleanup_scheduled_ = task_runner_->PostTask(FROM_HERE, cleanup_closure_);
     DCHECK(cleanup_scheduled_);
   }
 }
 
 }  // namespace audio
 }  // namespace media
 }  // namespace mojo