WIP - MSE: Drop non-keyframes that lack keyframe dependency

media/filters/frame_processor.h

Index: media/filters/frame_processor.h
diff --git a/media/filters/frame_processor.h b/media/filters/frame_processor.h
index 0afcf0ae17fc4be7fabd6c391db95bf3ab68256f..382967c2a09e2d61e4752f76a8919949a884504a 100644
--- a/media/filters/frame_processor.h
+++ b/media/filters/frame_processor.h
@@ -90,6 +90,17 @@ class MEDIA_EXPORT FrameProcessor {
   // preroll buffers.
   void OnPossibleAudioConfigUpdate(const AudioDecoderConfig& config);
 
+  // Must be called when the range removal algorithm has removed frames from the
+  // track associated with |track_id| in the inclusive range [|start_dts|,
+  // |end_dts|].
+  // Used to detect a potentially introduced append discontinuity caused by
+  // the range removal algorithm.
+  // Returns false on error, such as if |track_id| is unknown. Otherwise returns
+  // true.
+  bool OnRangeRemoval(StreamParser::TrackId track_id,
+                      DecodeTimestamp start_dts,
+                      DecodeTimestamp end_dts);
+
  private:
   typedef std::map<StreamParser::TrackId, MseTrackBuffer*> TrackBufferMap;