Implemented Multiple video track recoding.

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 db6b12b3efd81c8c2b973d6d8e4c466fa16f3964..daf60097c4ee1cc9f40bc4d12093a34e0f1d7273 100644
--- a/content/renderer/media/media_recorder_handler.h
+++ b/content/renderer/media/media_recorder_handler.h
@@ -58,10 +58,11 @@ class CONTENT_EXPORT MediaRecorderHandler final
  private:
   friend class MediaRecorderHandlerTest;
 
-  void OnEncodedVideo(const scoped_refptr<media::VideoFrame>& video_frame,
-                      scoped_ptr<std::string> encoded_data,
-                      base::TimeTicks timestamp,
-                      bool is_key_frame);
+//  void OnEncodedVideo(int track_index,
+//                      const scoped_refptr<media::VideoFrame>& video_frame,
+//                      scoped_ptr<std::string> encoded_data,
+//                      base::TimeTicks timestamp,
+//                      bool is_key_frame);

[mcasas, 2015/10/16 01:11:03]

?

[msu.koo, 2015/10/21 05:35:51]

Oops. Removed.

   void WriteData(base::StringPiece data);
 
   void OnVideoFrameForTesting(const scoped_refptr<media::VideoFrame>& frame,