Add VideoTrackSink interface to content/public

content/public/renderer/media_stream_video_sink.cc

Index: content/public/renderer/media_stream_video_sink.cc
diff --git a/content/public/renderer/media_stream_video_sink.cc b/content/public/renderer/media_stream_video_sink.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3068f1d09695e5a4b522f95e800dd0d32ee3d126
--- /dev/null
+++ b/content/public/renderer/media_stream_video_sink.cc
@@ -0,0 +1,28 @@
+// 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_stream_video_sink.h"
+
+#include "base/logging.h"
+#include "content/renderer/media/media_stream_video_track.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
+
+namespace content {
+
+void AddToVideoTrack(MediaStreamVideoSink* sink,
+                     const blink::WebMediaStreamTrack& track) {
+  DCHECK(track.source().type() == blink::WebMediaStreamSource::TypeVideo);

[tommi (sloooow) - chröme, 2013/11/27 16:53:07]

DCHECK_EQ?

[perkj_chrome, 2013/11/28 13:32:45]

Done.

+  MediaStreamVideoTrack* video_track =
+      static_cast <MediaStreamVideoTrack*>(track.extraData());

[tommi (sloooow) - chröme, 2013/11/27 16:53:07]

no space after static_cast

[perkj_chrome, 2013/11/28 13:32:45]

Done.

+  video_track->AddSink(sink);
+}
+
+void RemoveFromVideoTrack(MediaStreamVideoSink* sink,
+                          const blink::WebMediaStreamTrack& track) {
+  MediaStreamVideoTrack* video_track =
+      static_cast <MediaStreamVideoTrack*>(track.extraData());

[tommi (sloooow) - chröme, 2013/11/27 16:53:07]

ditto

[perkj_chrome, 2013/11/28 13:32:45]

Done.

+  video_track->RemoveSink(sink);
+}
+
+}  // namespace content