Refactor VideoRendererImpl to use VideoFrameScheduler.

media/filters/video_frame_scheduler_proxy.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.
 
 #ifndef MEDIA_FILTERS_VIDEO_FRAME_SCHEDULER_PROXY_H_
 #define MEDIA_FILTERS_VIDEO_FRAME_SCHEDULER_PROXY_H_
 
 #include "base/memory/weak_ptr.h"
 #include "media/filters/video_frame_scheduler.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace media {
 
 // Provides a thread-safe proxy for a VideoFrameScheduler. Typical use is to
 // use a real VideoFrameScheduler on the task runner responsible for graphics
 // display and provide a proxy on the task runner responsible for background
 // video decoding.
 class MEDIA_EXPORT VideoFrameSchedulerProxy : public VideoFrameScheduler {
  public:
   // |task_runner| is the runner that this object will be called on.
   // |scheduler_runner| is the runner that |scheduler| will be called on.
-  // |scheduler| must out-live the lifetime of this object.
   VideoFrameSchedulerProxy(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
       const scoped_refptr<base::SingleThreadTaskRunner>& scheduler_runner,
-      VideoFrameScheduler* scheduler);
+      scoped_ptr<VideoFrameScheduler> scheduler);
   virtual ~VideoFrameSchedulerProxy();
 
   // VideoFrameScheduler implementation.
   virtual void ScheduleVideoFrame(const scoped_refptr<VideoFrame>& frame,
                                   base::TimeTicks wall_ticks,
                                   const DoneCB& done_cb) OVERRIDE;
   virtual void Reset() OVERRIDE;
 
  private:
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> scheduler_runner_;
-  VideoFrameScheduler* scheduler_;  // Not owned.
+  scoped_ptr<VideoFrameScheduler> scheduler_;
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<VideoFrameSchedulerProxy> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoFrameSchedulerProxy);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_VIDEO_FRAME_SCHEDULER_PROXY_H_