[Chromecast] Add CmaMediaRendererFactory and IPC proxy components

chromecast/common/media/cma_ipc_common.cc

 // Copyright 2014 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 "chromecast/media/cma/pipeline/audio_pipeline.h"
+#include "chromecast/common/media/cma_ipc_common.h"
 
 namespace chromecast {
 namespace media {
 
-AudioPipeline::AudioPipeline() {
-}
-
-AudioPipeline::~AudioPipeline() {
-}
+const int kNoTrackId = -1;
+const int kAudioTrackId = 0;
+const int kVideoTrackId = 1;
 
 }  // namespace media
 }  // namespace chromecast
+