Implement missing features in WebrtcVideoStream.

remoting/protocol/webrtc_video_capturer_adapter.cc

Index: remoting/protocol/webrtc_video_capturer_adapter.cc
diff --git a/remoting/protocol/webrtc_video_capturer_adapter.cc b/remoting/protocol/webrtc_video_capturer_adapter.cc
index fcf7972ca44e40dc828080a2a69146866156b2bb..f40ff9505fd6a38978288f1604e1ee42931542a6 100644
--- a/remoting/protocol/webrtc_video_capturer_adapter.cc
+++ b/remoting/protocol/webrtc_video_capturer_adapter.cc
@@ -29,6 +29,12 @@ WebrtcVideoCapturerAdapter::~WebrtcVideoCapturerAdapter() {
   DCHECK(!capture_timer_);
 }
 
+void WebrtcVideoCapturerAdapter::SetSizeCallback(
+    const SizeCallback& size_callback) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  size_callback_ = size_callback;
+}
+
 bool WebrtcVideoCapturerAdapter::GetBestCaptureFormat(
     const cricket::VideoFormat& desired,
     cricket::VideoFormat* best_format) {
@@ -160,6 +166,9 @@ void WebrtcVideoCapturerAdapter::OnCaptureCompleted(
   size_t height = frame->size().height();
   if (!yuv_frame_ || yuv_frame_->GetWidth() != width ||
       yuv_frame_->GetHeight() != height) {
+    if (!size_callback_.is_null())
+      size_callback_.Run(frame->size());
+
     scoped_ptr<cricket::WebRtcVideoFrame> webrtc_frame(
         new cricket::WebRtcVideoFrame());
     webrtc_frame->InitToEmptyBuffer(width, height, 1, 1, 0);