Implement a source for remote video tracks.

content/renderer/media/mock_media_stream_dependency_factory.cc

 // Copyright (c) 2012 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/mock_media_stream_dependency_factory.h"
 
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/renderer/media/mock_peer_connection_impl.h"
 #include "content/renderer/media/webaudio_capturer_source.h"
@@ skipping 274 matching lines @@
   DCHECK(capturer_);
   return static_cast<MockRtcVideoCapturer*>(capturer_.get())->GetFrameNum();
 }
 
 MockLocalVideoTrack::MockLocalVideoTrack(std::string id,
                                          webrtc::VideoSourceInterface* source)
     : enabled_(false),
       id_(id),
       state_(MediaStreamTrackInterface::kLive),
       source_(source),
-      observer_(NULL) {
+      observer_(NULL),
+      renderer_(NULL) {
 }
 
 MockLocalVideoTrack::~MockLocalVideoTrack() {}
 
 void MockLocalVideoTrack::AddRenderer(VideoRendererInterface* renderer) {
-  NOTIMPLEMENTED();
+  DCHECK(!renderer_);
+  renderer_ = renderer;
 }
 
 void MockLocalVideoTrack::RemoveRenderer(VideoRendererInterface* renderer) {

[Jói, 2014/03/17 22:00:40]

The interface here is a little weird unless you plan to allow multiple renderers
in the future. If it's just the one renderer, then a SetRenderer would seem
simpler.

[perkj_chrome, 2014/03/19 16:34:48]

This is an overriden method. The real implementation in libjingle support
multiple but since I only need one renderer I DCHECK that is how I used it 
instead. I renamed this class to indicate what it really is.

-  NOTIMPLEMENTED();
+  DCHECK_EQ(renderer_, renderer);
+  renderer_ = NULL;
 }
 
 std::string MockLocalVideoTrack::kind() const {
   NOTIMPLEMENTED();
   return std::string();
 }
 
 std::string MockLocalVideoTrack::id() const { return id_; }
 
 bool MockLocalVideoTrack::enabled() const { return enabled_; }
@@ skipping 206 matching lines @@
   return WebRtcAudioCapturer::CreateCapturer(-1, device_info,
                                              constraints, NULL);
 }
 
 void MockMediaStreamDependencyFactory::StartLocalAudioTrack(
       WebRtcLocalAudioTrack* audio_track) {
   return;
 }
 
 }  // namespace content