Let WebSourceBufferImpl::setMode() update SourceState::sequence_mode_

media/filters/chunk_demuxer.h

Index: media/filters/chunk_demuxer.h
diff --git a/media/filters/chunk_demuxer.h b/media/filters/chunk_demuxer.h
index 5f37fc2ff0c783bfe4bd15a2a9fbf9d1a07b746e..91b47b1c596d4a26b572149dc81f799c68f2c65d 100644
--- a/media/filters/chunk_demuxer.h
+++ b/media/filters/chunk_demuxer.h
@@ -33,6 +33,11 @@ class MEDIA_EXPORT ChunkDemuxer : public Demuxer {
     kReachedIdLimit,  // Reached ID limit. We can't handle any more IDs.
   };
 
+  enum AppendMode {
+    kSegments,  // Timestamps in appended media determine coded frame placement.
+    kSequence   // Appended media will be treated as adjacent in time.
+  };
+
   // |open_cb| Run when Initialize() is called to signal that the demuxer
   //   is ready to receive media data via AppenData().
   // |need_key_cb| Run when the demuxer determines that an encryption key is
@@ -124,6 +129,12 @@ class MEDIA_EXPORT ChunkDemuxer : public Demuxer {
   // middle of parsing a media segment.
   bool SetTimestampOffset(const std::string& id, base::TimeDelta offset);
 
+  // Set the append mode to be applied to subsequent buffers appended to the
+  // source buffer associated with |id|. Returns true if the mode is set
+  // properly, false if the mode cannot be set because we're in the middle of
+  // parsing a media segment.
+  bool SetAppendMode(const std::string& id, AppendMode mode);
+
   // Called to signal changes in the "end of stream"
   // state. UnmarkEndOfStream() must not be called if a matching
   // MarkEndOfStream() has not come before it.