Notify demux stream clients when a stream is disabled.

media/renderers/renderer_impl.h

Index: media/renderers/renderer_impl.h
diff --git a/media/renderers/renderer_impl.h b/media/renderers/renderer_impl.h
index 76c496a125d462ecd6d2a2086270ff6f1339ad71..0752805fc118ebd6ecb374db25ab089773666ca4 100644
--- a/media/renderers/renderer_impl.h
+++ b/media/renderers/renderer_impl.h
@@ -62,7 +62,9 @@ class MEDIA_EXPORT RendererImpl : public Renderer {
   bool HasAudio() final;
   bool HasVideo() final;
 
-  void RestartStreamPlayback(DemuxerStream* stream, base::TimeDelta time);
+  void RestartStreamPlayback(DemuxerStream* stream,
+                             bool enabled,
+                             base::TimeDelta time);
 
   // Helper functions for testing purposes. Must be called before Initialize().
   void DisableUnderflowForTesting();