Make WebRtcVideoChannel2::WebRtcVideoSendStream implement rtc::VideoRendererInterface.

talk/app/webrtc/webrtcsession.cc

Index: talk/app/webrtc/webrtcsession.cc
diff --git a/talk/app/webrtc/webrtcsession.cc b/talk/app/webrtc/webrtcsession.cc
index b1a7c21c7e23dc60092cd6cb790011e055f98488..1b051c552f4be6901ad1ff86e56bae7bb6f14a98 100644
--- a/talk/app/webrtc/webrtcsession.cc
+++ b/talk/app/webrtc/webrtcsession.cc
@@ -1361,6 +1361,16 @@ void WebRtcSession::SetVideoSend(uint32_t ssrc,
   }
 }
 
+rtc::VideoSinkInterface<cricket::VideoFrame>* WebRtcSession::GetSink(
+    uint32_t ssrc) {
+  ASSERT(signaling_thread()->IsCurrent());
+  if (!video_channel_) {
+    LOG(LS_WARNING) << "GetSink: No video channel exists.";
+    return NULL;
+  }
+  return video_channel_->GetSink(ssrc);
+}
+
 bool WebRtcSession::CanInsertDtmf(const std::string& track_id) {
   ASSERT(signaling_thread()->IsCurrent());
   if (!voice_channel_) {