Add video-rendering to mojo media pipeline.

media/blink/video_frame_compositor.cc

Index: media/blink/video_frame_compositor.cc
diff --git a/media/blink/video_frame_compositor.cc b/media/blink/video_frame_compositor.cc
index 210d197b10eafa9bb7d7cfb126d14132fa62b54d..1d5b32a185310864d56819ad4627914e7ba70c2f 100644
--- a/media/blink/video_frame_compositor.cc
+++ b/media/blink/video_frame_compositor.cc
@@ -18,11 +18,9 @@ const int kBackgroundRenderingTimeoutMs = 250;
 
 VideoFrameCompositor::VideoFrameCompositor(
     const scoped_refptr<base::SingleThreadTaskRunner>& compositor_task_runner,
-    const base::Callback<void(gfx::Size)>& natural_size_changed_cb,
     const base::Callback<void(bool)>& opacity_changed_cb)
     : compositor_task_runner_(compositor_task_runner),
       tick_clock_(new base::DefaultTickClock()),
-      natural_size_changed_cb_(natural_size_changed_cb),
       opacity_changed_cb_(opacity_changed_cb),
       background_rendering_enabled_(true),
       background_rendering_timer_(
@@ -193,11 +191,6 @@ bool VideoFrameCompositor::ProcessNewFrame(
   // subsequent PutCurrentFrame() call it will mark it as rendered.
   rendered_last_frame_ = false;
 
-  if (current_frame_ &&
-      current_frame_->natural_size() != frame->natural_size()) {
-    natural_size_changed_cb_.Run(frame->natural_size());
-  }
-
   if (!current_frame_ ||
       IsOpaque(current_frame_->format()) != IsOpaque(frame->format()))
     opacity_changed_cb_.Run(IsOpaque(frame->format()));