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

ppapi/thunk/ppb_media_stream_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_TRACK_API_H_
+#define PPAPI_THUNK_MEDIA_STREAM_TRACK_API_H_
+
+#include "base/memory/ref_counted.h"
+#include "ppapi/c/pp_bool.h"
+#include "ppapi/c/pp_var.h"
+
+namespace ppapi {
+
+class TrackedCallback;
+
+namespace thunk {
+
+class PPB_MediaStreamTrack_API {
+ public:
+  virtual ~PPB_MediaStreamTrack_API() {}
+  virtual PP_Var GetId() = 0;
+  virtual PP_Bool HasEnded() = 0;
+  virtual int32_t GetFrame(
+      PP_Resource* frame,
+      const scoped_refptr<ppapi::TrackedCallback>& callback) = 0;
+  virtual int32_t RecycleFrame(PP_Resource frame) = 0;
+  virtual void Close() = 0;
+};
+
+}  // namespace thunk
+}  // namespace ppapi
+
+#endif  // PPAPI_THUNK_MEDIA_STREAM_VIDEO_TRACK_API_H_