Define the interface for MediaStreamVideoSource.

content/renderer/media/media_stream_video_source.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/renderer/media/media_stream_video_source.h"
+
+#include "base/logging.h"
+#include "content/public/renderer/media_stream_video_sink.h"
+
+namespace content {
+
+void MediaStreamVideoSource::AddTrack(
+    const blink::WebMediaStreamTrack& track,
+    const blink::WebMediaConstraints& constraints) {
+  // TODO(ronghuawu): Put |track| in the registered tracks list. Will later
+  // deliver frames to it according to |constraints|.
+}
+
+void MediaStreamVideoSource::RemoveTrack(
+    const blink::WebMediaStreamTrack& track) {
+  // TODO(ronghuawu): Remove |track| from the list, i.e. will stop delivering
+  // frame to |track|.
+}
+
+void MediaStreamVideoSource::SetReadyState(
+          blink::WebMediaStreamSource::ReadyState state) {
+  // TODO(ronghuawu): Sets WebMediaStreamSource's ready state and notifies the
+  // ready state to all registered tracks.
+}
+
+void MediaStreamVideoSource::PutVideoFrame(
+    const scoped_refptr<media::VideoFrame>& frame) {
+  // TODO(ronghuawu): Deliver |frame| to all the registered tracks.
+}
+
+MediaStreamVideoSource::~MediaStreamVideoSource() {
+}
+
+}  // namespace content