[Chromecast] Log playback stall event.

chromecast/media/cma/pipeline/media_pipeline_impl.h

Index: chromecast/media/cma/pipeline/media_pipeline_impl.h
diff --git a/chromecast/media/cma/pipeline/media_pipeline_impl.h b/chromecast/media/cma/pipeline/media_pipeline_impl.h
index 753c5ef31f2ea521b01ccfc12ad77003f459c62e..872181f6fe2bcd13028d7baa647eaae97495b7d6 100644
--- a/chromecast/media/cma/pipeline/media_pipeline_impl.h
+++ b/chromecast/media/cma/pipeline/media_pipeline_impl.h
@@ -74,6 +74,9 @@ class MediaPipelineImpl {
     BACKEND_STATE_PAUSED
   };
   struct FlushTask;
+  void CheckForPlaybackStall(base::TimeDelta media_time,
+                             base::TimeTicks current_stc);
+
   void OnFlushDone(bool is_audio_stream);
 
   // Invoked to notify about a change of buffering state.
@@ -116,6 +119,11 @@ class MediaPipelineImpl {
   int audio_bytes_for_bitrate_estimation_;
   int video_bytes_for_bitrate_estimation_;
 
+  // Playback stalled handling.
+  bool playback_stalled_;
+  base::TimeTicks playback_stalled_time_;
+  bool playback_stalled_notification_sent_;
+
   base::WeakPtr<MediaPipelineImpl> weak_this_;
   base::WeakPtrFactory<MediaPipelineImpl> weak_factory_;