WebmMuxer-MediaRecorderHandler: thread hopping and data ownership

content/renderer/media/media_recorder_handler.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 CONTENT_RENDERER_MEDIA_MEDIA_RECORDER_HANDLER_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_RECORDER_HANDLER_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
-#include "base/strings/string_piece.h"
 #include "base/threading/thread_checker.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebMediaRecorderHandler.h"
 #include "third_party/WebKit/public/platform/WebMediaStream.h"
 
 namespace blink {
 class WebMediaRecorderHandlerClient;
 class WebString;
 }  // namespace blink
 
@@ skipping 28 matching lines @@
                   const blink::WebString& mimeType) override;
   bool start() override;
   bool start(int timeslice) override;
   void stop() override;
   void pause() override;
   void resume() override;
 
  private:
   friend class MediaRecorderHandlerTest;
 
-  void WriteData(const base::StringPiece& data);
+  void WriteData(scoped_ptr<std::string> data);
 
   void OnVideoFrameForTesting(const scoped_refptr<media::VideoFrame>& frame,
                               const base::TimeTicks& timestamp);
 
   // Bound to the main render thread.
   base::ThreadChecker main_render_thread_checker_;
 
   bool recording_;
   blink::WebMediaStream media_stream_;  // The MediaStream being recorded.
 
   // |client_| is a weak pointer, and is valid for the lifetime of this object.
   blink::WebMediaRecorderHandlerClient* client_;
 
   ScopedVector<VideoTrackRecorder> video_recorders_;
 
   // Worker class doing the actual Webm Muxing work.
-  scoped_ptr<media::WebmMuxer> webm_muxer_;
+  scoped_refptr<media::WebmMuxer> webm_muxer_;
 
   base::WeakPtrFactory<MediaRecorderHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaRecorderHandler);
 };
 
 }  // namespace content
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_RECORDER_HANDLER_H_