WebmMuxer-MediaRecorderHandler: thread hopping and data ownership

content/renderer/media/media_recorder_handler.h

Index: content/renderer/media/media_recorder_handler.h
diff --git a/content/renderer/media/media_recorder_handler.h b/content/renderer/media/media_recorder_handler.h
index a97843bba757f81ed06da8c691718b4bf3962300..d08a80943a79d917c68066d27870cba59571ace4 100644
--- a/content/renderer/media/media_recorder_handler.h
+++ b/content/renderer/media/media_recorder_handler.h
@@ -8,7 +8,6 @@
 #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"
@@ -57,7 +56,7 @@ class CONTENT_EXPORT MediaRecorderHandler final
  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);
@@ -74,7 +73,7 @@ class CONTENT_EXPORT MediaRecorderHandler final
   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_;