Add VideoTrackSink interface to content/public

content/public/renderer/media/video_track_sink.cc

+// Copyright 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.
+
+#include "content/public/renderer/media/video_track_sink.h"
+
+#include "base/logging.h"
+#include "content/renderer/media/video_track.h"

[Alpha Left Google, 2013/11/26 04:59:32]

content/public cannot include content/renderer so this is not possible.

The Register() and UnRegister() methods below should be some static methods
implemented in content/renderer/media.

[perkj_chrome, 2013/11/26 09:16:38]

is that true? See content/public/renderer/render_video_observer.cc

[Alpha Left Google, 2013/11/26 10:00:47]

I cannot locate the file you mentioned.

[Jói, 2013/11/26 10:18:15]

A .cc file in content/public/renderer can include files from content/renderer,
but .h files cannot.

+#include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
+
+namespace media {
+class VideoFrame;
+}
+
+namespace content {
+
+void VideoTrackSink::Register(const blink::WebMediaStreamTrack& track) {
+  DCHECK(track.source().type() == blink::WebMediaStreamSource::TypeVideo);
+  VideoTrack* video_track = static_cast <VideoTrack*>(track.extraData());
+  video_track->RegisterSink(this);
+}
+
+void VideoTrackSink::UnRegister(const blink::WebMediaStreamTrack& track) {
+  VideoTrack* video_track = static_cast <VideoTrack*>(track.extraData());
+  video_track->UnRegisterSink(this);
+}
+
+MediaTrackSink::ReadyState MediaTrackSink::GetSourceState(
+    const blink::WebMediaStreamTrack& track) const{
+  switch (track.source().readyState()) {
+    case blink::WebMediaStreamSource::ReadyStateLive:
+      return MediaTrackSink::kLive;
+    case blink::WebMediaStreamSource::ReadyStateMuted:
+      return MediaTrackSink::kMuted;
+    case blink::WebMediaStreamSource::ReadyStateEnded:
+      return MediaTrackSink::kEnded;
+    default:

[no longer working on chromium, 2013/11/25 13:55:07]

nit, you don't need default case if you have already covered all the cases.

[perkj_chrome, 2013/11/26 09:16:38]

These are removed.

+      NOTREACHED();
+  }
+  return MediaTrackSink::kEnded;
+}
+
+}  // namespace content