Add video-rendering to mojo media pipeline.

media/renderers/video_renderer_impl.cc

Index: media/renderers/video_renderer_impl.cc
diff --git a/media/renderers/video_renderer_impl.cc b/media/renderers/video_renderer_impl.cc
index 11caf253b4d693b95c1c4bac4851eaf62b8d8457..bc1156154912bd4efd12d00bce66988ae3a833b4 100644
--- a/media/renderers/video_renderer_impl.cc
+++ b/media/renderers/video_renderer_impl.cc
@@ -126,6 +126,7 @@ void VideoRendererImpl::Initialize(
     CdmContext* cdm_context,
     const StatisticsCB& statistics_cb,
     const BufferingStateCB& buffering_state_cb,
+    const NaturalSizeChangedCB& natural_size_changed_cb,
     const base::Closure& ended_cb,
     const PipelineStatusCB& error_cb,
     const TimeSource::WallClockTimeCB& wall_clock_time_cb,
@@ -158,7 +159,7 @@ void VideoRendererImpl::Initialize(
   // calls to OnTimeStateChanged() under lock, which can deadlock the compositor
   // and media threads.
   buffering_state_cb_ = BindToCurrentLoop(buffering_state_cb);
-
+  natural_size_changed_cb_ = natural_size_changed_cb;
   statistics_cb_ = statistics_cb;
   ended_cb_ = ended_cb;
   error_cb_ = error_cb;
@@ -186,6 +187,12 @@ scoped_refptr<VideoFrame> VideoRendererImpl::Render(
   // we've had a proper startup sequence.
   DCHECK(result);
 
+  if (last_frame_natural_size_ != result->natural_size()) {
+    last_frame_natural_size_ = result->natural_size();
+    task_runner_->PostTask(FROM_HERE, base::Bind(natural_size_changed_cb_,
+                                                 last_frame_natural_size_));
+  }
+
   // Declare HAVE_NOTHING if we reach a state where we can't progress playback
   // any further.  We don't want to do this if we've already done so, reached
   // end of stream, or have frames available.  We also don't want to do this in
@@ -243,7 +250,6 @@ scoped_refptr<VideoFrame> VideoRendererImpl::Render(
   // the time it runs (may be delayed up to 50ms for complex decodes!) we might.
   task_runner_->PostTask(FROM_HERE, base::Bind(&VideoRendererImpl::AttemptRead,
                                                weak_factory_.GetWeakPtr()));
-
   return result;
 }