Add video-rendering to mojo media pipeline.

media/renderers/video_renderer_impl.h

Index: media/renderers/video_renderer_impl.h
diff --git a/media/renderers/video_renderer_impl.h b/media/renderers/video_renderer_impl.h
index 9f1c01c7bba37615c7ed4ff479768b2b846603a5..4c4ec8b4e600674aee131125e40f89f2459a04e0 100644
--- a/media/renderers/video_renderer_impl.h
+++ b/media/renderers/video_renderer_impl.h
@@ -68,6 +68,7 @@ class MEDIA_EXPORT VideoRendererImpl
                   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,
@@ -231,6 +232,7 @@ class MEDIA_EXPORT VideoRendererImpl
   PipelineStatusCB init_cb_;
   StatisticsCB statistics_cb_;
   BufferingStateCB buffering_state_cb_;
+  NaturalSizeChangedCB natural_size_changed_cb_;
   base::Closure ended_cb_;
   PipelineStatusCB error_cb_;
   TimeSource::WallClockTimeCB wall_clock_time_cb_;
@@ -267,6 +269,9 @@ class MEDIA_EXPORT VideoRendererImpl
   // call.
   int64_t last_video_memory_usage_;
 
+  // Tracks video natural size to detect and notify upstream of any changes.
+  gfx::Size last_frame_natural_size_;
+
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<VideoRendererImpl> weak_factory_;