Adds MediaStreamSource, MediaStreamAudioSource and MediaStreamVideoCaptureDeviceSource

content/renderer/media/media_stream_audio_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_audio_source.h"
+
+namespace content {
+
+MediaStreamAudioSource::MediaStreamAudioSource(
+    const StreamDeviceInfo& device_info,
+    const SourceStopCallback& stop_callback) {
+  SetDeviceInfo(device_info);
+  SetStopCallback(stop_callback);
+}
+
+MediaStreamAudioSource::MediaStreamAudioSource() {}
+
+MediaStreamAudioSource::~MediaStreamAudioSource() {}
+
+void MediaStreamAudioSource::DoStopSource() {
+  if (GetAudioCapturer())
+    GetAudioCapturer()->Stop();
+}
+
+void MediaStreamAudioSource::ApplyConstraints(
+    const blink::WebMediaStreamTrack& track,
+    const blink::WebMediaConstraints& constraints,
+    const ConstraintsCallback& callback) {
+    // TODO(xians): Implement for audio sources.
+    NOTIMPLEMENTED();
+    callback.Run(this, true);
+}
+
+}  // namespace content