[Chromecast] Add CmaMediaRendererFactory and IPC proxy components

chromecast/common/media/cma_ipc_common.h

 // 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/media_pipeline_client.h"
+#ifndef CHROMECAST_COMMON_MEDIA_CMA_IPC_COMMON_H_
+#define CHROMECAST_COMMON_MEDIA_CMA_IPC_COMMON_H_
 
 namespace chromecast {
 namespace media {
 
-MediaPipelineClient::MediaPipelineClient() {
-}
-
-MediaPipelineClient::~MediaPipelineClient() {
-}
+enum TrackId {
+  kNoTrackId = -1,
+  kAudioTrackId = 0,
+  kVideoTrackId = 1,
+};
 
 }  // namespace media
 }  // namespace chromecast
+
+#endif  // CHROMECAST_COMMON_MEDIA_CMA_IPC_COMMON_H_
+