Add video-rendering to mojo media pipeline.

media/blink/webmediaplayer_impl.cc

Index: media/blink/webmediaplayer_impl.cc
diff --git a/media/blink/webmediaplayer_impl.cc b/media/blink/webmediaplayer_impl.cc
index d1f5f2e384f0ddc5805052c11e673fac9da0fd6c..d4b5baca1e7a11992b8f307a2d3e3dd0fb528401 100644
--- a/media/blink/webmediaplayer_impl.cc
+++ b/media/blink/webmediaplayer_impl.cc
@@ -195,7 +195,6 @@ WebMediaPlayerImpl::WebMediaPlayerImpl(
               : base::MessageLoop::current()->task_runner()),
       compositor_(new VideoFrameCompositor(
           compositor_task_runner_,
-          BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnNaturalSizeChanged),
           BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnOpacityChanged))),
       is_cdm_attached_(false),
 #if defined(OS_ANDROID)  // WMPI_CAST
@@ -1276,6 +1275,7 @@ void WebMediaPlayerImpl::StartPipeline() {
       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineEnded),
       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineMetadata),
       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineBufferingStateChanged),
+      BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnNaturalSizeChanged),
       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnDurationChanged),
       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnAddTextTrack),
       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnWaitingForDecryptionKey));
@@ -1329,7 +1329,7 @@ void WebMediaPlayerImpl::OnDurationChanged() {
   client_->durationChanged();
 }
 
-void WebMediaPlayerImpl::OnNaturalSizeChanged(gfx::Size size) {
+void WebMediaPlayerImpl::OnNaturalSizeChanged(const gfx::Size& size) {
   DCHECK(main_task_runner_->BelongsToCurrentThread());
   DCHECK_NE(ready_state_, WebMediaPlayer::ReadyStateHaveNothing);
   TRACE_EVENT0("media", "WebMediaPlayerImpl::OnNaturalSizeChanged");