Use of the playback time in the MSE garbage collection.

media/filters/source_buffer_stream.h

Index: media/filters/source_buffer_stream.h
diff --git a/media/filters/source_buffer_stream.h b/media/filters/source_buffer_stream.h
index 362a9ab6272f49d9a9f33f6af8f9da870397814e..0099fe05fed077733fe13bc44974ffb9526a8dd7 100644
--- a/media/filters/source_buffer_stream.h
+++ b/media/filters/source_buffer_stream.h
@@ -89,6 +89,8 @@ class MEDIA_EXPORT SourceBufferStream {
   void Remove(base::TimeDelta start, base::TimeDelta end,
               base::TimeDelta duration);
 
+  void NotifyMediaTimeUpdate(DecodeTimestamp media_time);
+
   // Changes the SourceBufferStream's state so that it will start returning
   // buffers starting from the closest keyframe before |timestamp|.
   void Seek(base::TimeDelta timestamp);
@@ -365,6 +367,10 @@ class MEDIA_EXPORT SourceBufferStream {
   // emptied.
   SourceBufferRange* selected_range_;
 
+  // Current media time.
+  // If not exact, the media time must be a lower bound of the media time.
+  DecodeTimestamp current_media_time_;
+
   // Queue of the next buffers to be returned from calls to GetNextBuffer(). If
   // |track_buffer_| is empty, return buffers from |selected_range_|.
   BufferQueue track_buffer_;