MSE: Experimental support for new abort and duration behavior

media/filters/media_source_state.h

Index: media/filters/media_source_state.h
diff --git a/media/filters/media_source_state.h b/media/filters/media_source_state.h
index 30a604fbfc3ef7939393e486fa1e4813fe8c3fae..9a7b72180caa77531435de1ef6368aa1278a147b 100644
--- a/media/filters/media_source_state.h
+++ b/media/filters/media_source_state.h
@@ -89,6 +89,10 @@ class MEDIA_EXPORT MediaSourceState {
   // end of stream range logic needs to be executed.
   Ranges<TimeDelta> GetBufferedRanges(TimeDelta duration, bool ended) const;
 
+  // Returns the highest PTS of currently buffered frames in this source, or
+  // base::TimeDelta() if none of the streams contain buffered data.
+  TimeDelta GetHighestPresentationTimestamp() const;
+
   // Returns the highest buffered duration across all streams managed
   // by this object.
   // Returns TimeDelta() if none of the streams contain buffered data.