Adds MediaStreamSource, MediaStreamAudioSource and MediaStreamVideoCaptureDeviceSource

content/renderer/media/media_stream_video_capture_device_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_video_capture_device_source.h"
+
+#include "base/bind.h"
+#include "base/debug/trace_event.h"
+#include "content/renderer/media/rtc_media_constraints.h"
+#include "content/renderer/media/rtc_video_capturer.h"
+
+namespace content {
+
+MediaStreamVideoCaptureDeviceSource::MediaStreamVideoCaptureDeviceSource(
+    const StreamDeviceInfo& device_info,
+    const SourceStoppedCallback& stop_callback,
+    MediaStreamDependencyFactory* factory)
+    : MediaStreamVideoSource(factory) {
+  SetDeviceInfo(device_info);
+  SetStopCallback(stop_callback);
+}
+
+MediaStreamVideoCaptureDeviceSource::~MediaStreamVideoCaptureDeviceSource() {
+}
+
+void MediaStreamVideoCaptureDeviceSource::Init(
+    const blink::WebMediaConstraints& constraints) {
+  // Create the webrtc::VideoSource implementation.
+  RTCMediaConstraints webrtc_constraints(constraints);
+  cricket::VideoCapturer* capturer =
+      factory()->CreateVideoCapturer(device_info());
+  SetAdapter(factory()->CreateVideoSource(capturer,
+                                          &webrtc_constraints));

[Ronghua Wu (Left Chromium), 2014/01/16 23:02:37]

I think this should call the base class Init at the end. It's a no-op today, but
we may add other stuff to base class init in the future. 

[perkj_chrome, 2014/01/17 13:19:45]

ptal - its the other way around. The base class call init and this overrides the
base class implementation.
Once I don't need the RTCVideoCapturer (cricket::VideoCapturer) This goes away.

+}
+
+}  // namespace content