[PPAPI] Implement media stream video track API

content/renderer/pepper/pepper_media_stream_video_track_host.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 CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_
+#define CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_
+
+#include "base/compiler_specific.h"
+#include "content/public/renderer/media_stream_video_sink.h"
+#include "content/renderer/pepper/pepper_media_stream_track_host_base.h"
+#include "media/base/video_frame.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
+#include "ui/gfx/size.h"
+
+namespace content {
+
+class PepperMediaStreamVideoTrackHost :
+  public PepperMediaStreamTrackHostBase,

[yzshen1, 2014/01/10 21:05:17]

wrong indent, and please also move ':' from the previous line to this line.

[Peng, 2014/01/10 22:46:58]

Done.

+  public MediaStreamVideoSink {
+ public:
+  PepperMediaStreamVideoTrackHost(RendererPpapiHost* host,
+                                  PP_Instance instance,
+                                  PP_Resource resource,
+                                  const blink::WebMediaStreamTrack& track);
+
+ private:
+  virtual ~PepperMediaStreamVideoTrackHost();
+
+  // PepperMediaStreamTrackHostBase overrides:
+  virtual void OnClose() OVERRIDE;
+
+  // MediaStreamVideoSink overrides:
+  virtual void OnVideoFrame(
+      const scoped_refptr<media::VideoFrame>& frame) OVERRIDE;
+
+  virtual void DidConnectPendingHostToResource() OVERRIDE;

[bbudge, 2014/01/10 22:57:06]

Could you comment this:
// ResourceHost overrides.

[Peng, 2014/01/13 19:10:15]

Done.

+
+  blink::WebMediaStreamTrack track_;
+
+  // True if it has been added to |blink::WebMediaStreamTrack| as a sink.
+  bool connected_;
+
+  // Frame size.
+  gfx::Size frame_size_;
+
+  // Frame format.
+  media::VideoFrame::Format frame_format_;
+
+  // The size of frame pixels in bytes.
+  uint32_t frame_data_size_;
+
+  DISALLOW_COPY_AND_ASSIGN(PepperMediaStreamVideoTrackHost);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_