Adds MediaStreamSource, MediaStreamAudioSource and MediaStreamVideoCaptureDeviceSource

content/renderer/media/media_stream_source.cc

+// Copyright 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.
+
+#include "content/renderer/media/media_stream_source.h"
+
+namespace content {
+
+MediaStreamSource::MediaStreamSource() {
+}
+
+MediaStreamSource::~MediaStreamSource() {}
+
+void MediaStreamSource::StopSource() {
+  DoStopSource();
+  if (!stop_callback_.is_null())
+    stop_callback_.Run(owner());
+
+  owner().setReadyState(blink::WebMediaStreamSource::ReadyStateEnded);
+  owner().setExtraData(NULL);
+}
+
+}  // namespace content