Add Pepper VideoReader and VideoWriter plumbing

ppapi/thunk/ppb_video_source_private_api.h

Index: ppapi/thunk/ppb_video_source_private_api.h
diff --git a/ppapi/thunk/ppb_video_source_private_api.h b/ppapi/thunk/ppb_video_source_private_api.h
new file mode 100644
index 0000000000000000000000000000000000000000..c73205151345ded82e12efe6ce8654ffbae08ea5
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+++ b/ppapi/thunk/ppb_video_source_private_api.h
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+// Copyright (c) 2013 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_PPB_VIDEO_SOURCE_PRIVATE_API_H_
+#define PPAPI_THUNK_PPB_VIDEO_SOURCE_PRIVATE_API_H_
+
+#include "base/memory/ref_counted.h"
+#include "ppapi/thunk/ppapi_thunk_export.h"
+
+struct PP_VideoFrame_Private;
+
+namespace ppapi {
+
+class TrackedCallback;
+
+namespace thunk {
+
+class PPAPI_THUNK_EXPORT PPB_VideoSource_Private_API {
+ public:
+  virtual ~PPB_VideoSource_Private_API() {}
+
+  virtual int32_t Open(const PP_Var& stream_url,
+                       scoped_refptr<TrackedCallback> callback) = 0;
+  virtual int32_t GetFrame(PP_VideoFrame_Private* frame,
+                           scoped_refptr<TrackedCallback> callback) = 0;
+  virtual void Close() = 0;
+};
+
+}  // namespace thunk
+}  // namespace ppapi
+
+#endif  // PPAPI_THUNK_PPB_VIDEO_SOURCE_PRIVATE_API_H_