[NOT FOR REVIEW][PPAPI] Implement MediaStreamVideoTrack pepper API

ppapi/thunk/ppb_media_stream_video_track_api.h

+// Copyright (c) 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 PPAPI_THUNK_MEDIA_STREAM_VIDEO_TRACK_API_H_
+#define PPAPI_THUNK_MEDIA_STREAM_VIDEO_TRACK_API_H_
+
+#include "ppapi/thunk/ppb_media_stream_track_api.h"
+
+namespace ppapi {
+namespace thunk {
+
+class PPB_MediaStreamVideoTrack_API : virtual public PPB_MediaStreamTrack_API{
+ public:
+  virtual ~PPB_MediaStreamVideoTrack_API() {}
+  virtual int32_t Configure(uint32_t max_buffered_frames) = 0;
+};
+
+}  // namespace thunk
+}  // namespace ppapi
+
+#endif  // PPAPI_THUNK_MEDIA_STREAM_VIDEO_TRACK_API_H_