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(
+    int render_view_id,
+    const StreamDeviceInfo& device_info,
+    const SourceStoppedCallback& stop_callback,
+    MediaStreamDependencyFactory* factory)
+    : render_view_id_(render_view_id),
+      factory_(factory) {
+  SetDeviceInfo(device_info);
+  SetStopCallback(stop_callback);
+}
+
+MediaStreamAudioSource::MediaStreamAudioSource()
+    : render_view_id_(-1),
+      factory_(NULL) {
+}
+
+MediaStreamAudioSource::~MediaStreamAudioSource() {}
+
+void MediaStreamAudioSource::DoStopSource() {
+  audio_capturer_->Stop();
+}
+
+void MediaStreamAudioSource::AddTrack(
+    const blink::WebMediaStreamTrack& track,
+    const blink::WebMediaConstraints& constraints,
+    const ConstraintsCallback& callback) {
+  // TODO(xians): Properly implement for audio sources.
+  bool result = true;
+  if (factory_ && !local_audio_source_) {
+    result = factory_->InitializeMediaStreamAudioSource(render_view_id_,
+                                                        constraints,
+                                                        this);
+

[Jói, 2014/01/27 22:14:57]

nit: unnecessary blank line

[perkj_chrome, 2014/01/28 08:31:43]

Done.

+  }
+
+  callback.Run(this, result);
+}
+
+void MediaStreamAudioSource::RemoveTrack(
+    const blink::WebMediaStreamTrack& track) {
+  NOTIMPLEMENTED();
+}
+
+}  // namespace content