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 c6d1856f0353957224932aeb8e0c076e4ccdfaa9..bb61f56b2af2d5c5b46a3ffbce7730a9791bd738 100644
--- a/talk/app/webrtc/webrtcsession.cc
+++ b/talk/app/webrtc/webrtcsession.cc
@@ -1390,6 +1390,16 @@ 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_) {