Introduce TimeSource notifications to the VideoRenderer.

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 704c5ed3befc8475b4eb478e3376c4aac7a8dd45..9b3ddb8f9a363f950190c5f6a5b260a2705193d1 100644
--- a/media/renderers/video_renderer_impl.cc
+++ b/media/renderers/video_renderer_impl.cc
@@ -275,6 +275,14 @@ void VideoRendererImpl::SetTickClockForTesting(
   tick_clock_.swap(tick_clock);
 }
 
+void VideoRendererImpl::OnTimeProgressing() {
+  // TODO(dalecurtis): Wire up to the VideoRendererSink once it's implemented.
+}
+
+void VideoRendererImpl::OnTimeStopped() {
+  // TODO(dalecurtis): Wire up to the VideoRendererSink once it's implemented.
+}
+
 void VideoRendererImpl::PaintNextReadyFrame_Locked() {
   lock_.AssertAcquired();