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 b0affc0dcbd287fe4ec1acd2aa91dbb40ec4a948..70b0e710f6510bd3bff65f8a11901d10768326d0 100644
--- a/media/blink/webmediaplayer_impl.cc
+++ b/media/blink/webmediaplayer_impl.cc
@@ -196,7 +196,6 @@ 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
@@ -1289,6 +1288,7 @@ 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));
@@ -1342,7 +1342,7 @@ 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");