[chromecast] Adds MediaSinkDefault.

chromecast/media/cma/backend/media_pipeline_backend_default.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 CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_PIPELINE_BACKEND_DEFAULT_H_
 #define CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_PIPELINE_BACKEND_DEFAULT_H_
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/macros.h"
-#include "base/time/time.h"
 #include "chromecast/public/media/media_pipeline_backend.h"
 
 namespace chromecast {
 namespace media {
 class AudioDecoderDefault;
 class VideoDecoderDefault;
 
 // Factory that instantiates default (stub) media pipeline device elements.
 class MediaPipelineBackendDefault : public MediaPipelineBackend {
  public:
   MediaPipelineBackendDefault();
   ~MediaPipelineBackendDefault() override;
 
-  bool running() const { return running_; }
   const AudioDecoderDefault* audio_decoder() const {
     return audio_decoder_.get();
   }
   const VideoDecoderDefault* video_decoder() const {
     return video_decoder_.get();
   }
 
   // MediaPipelineBackend implementation:
   AudioDecoder* CreateAudioDecoder() override;
   VideoDecoder* CreateVideoDecoder() override;
   bool Initialize() override;
   bool Start(int64_t start_pts) override;
   void Stop() override;
   bool Pause() override;
   bool Resume() override;
   int64_t GetCurrentPts() override;
   bool SetPlaybackRate(float rate) override;
 
  private:
-  int64_t start_pts_;
-  base::TimeTicks start_clock_;
-  bool running_;
+  enum State {
+    kStateUninitialized,
+    kStateInitialized,
+    kStatePlaying,
+    kStatePaused,
+  };
+  State state_;
   float rate_;
-
   std::unique_ptr<AudioDecoderDefault> audio_decoder_;
   std::unique_ptr<VideoDecoderDefault> video_decoder_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaPipelineBackendDefault);
 };
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_PIPELINE_BACKEND_DEFAULT_H_