Add Pepper VideoReader and VideoWriter plumbing

ppapi/proxy/video_source_resource.h

Index: ppapi/proxy/video_source_resource.h
diff --git a/ppapi/proxy/video_source_resource.h b/ppapi/proxy/video_source_resource.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_PROXY_VIDEO_SOURCE_RESOURCE_H_
+#define PPAPI_PROXY_VIDEO_SOURCE_RESOURCE_H_
+
+#include <string>
+
+#include "ppapi/c/pp_time.h"
+#include "ppapi/proxy/connection.h"
+#include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/proxy/ppapi_proxy_export.h"
+#include "ppapi/shared_impl/var.h"
+#include "ppapi/thunk/ppb_video_source_private_api.h"
+
+struct PP_VideoFrame_Private;
+
+namespace ppapi {
+
+class TrackedCallback;
+
+namespace proxy {
+
+class PPAPI_PROXY_EXPORT VideoSourceResource
+    : public PluginResource,
+      public thunk::PPB_VideoSource_Private_API {
+ public:
+  VideoSourceResource(Connection connection,
+                      PP_Instance instance);
+  virtual ~VideoSourceResource();
+
+  // Resource overrides.
+  virtual thunk::PPB_VideoSource_Private_API*
+      AsPPB_VideoSource_Private_API() OVERRIDE;
+
+  // PPB_VideoSource_Private_API implementation.
+  virtual int32_t Open(
+      const PP_Var& stream_url,
+      scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t GetFrame(
+      PP_VideoFrame_Private* frame,
+      scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual void Close() OVERRIDE;
+
+ private:
+  void OnPluginMsgOpenComplete(
+      const ResourceMessageReplyParams& params);
+  void OnPluginMsgGetFrameComplete(
+      PP_VideoFrame_Private* frame,
+      const ResourceMessageReplyParams& params,
+      const HostResource& image_data,
+      PP_TimeTicks timestamp);
+
+  scoped_refptr<TrackedCallback> open_callback_;
+  scoped_refptr<TrackedCallback> get_frame_callback_;
+  bool is_open_;
+
+  DISALLOW_COPY_AND_ASSIGN(VideoSourceResource);
+};
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_VIDEO_SOURCE_RESOURCE_H_