Fix SourceBufferStream alt-ref frame handling.

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 df32ca39d007822366376c73bb46318bc743b631..8625c3a61de43d2e840f6e8fe15e7f9264b37f6a 100644
--- a/media/filters/source_buffer_stream.h
+++ b/media/filters/source_buffer_stream.h
@@ -125,7 +125,10 @@ class MEDIA_EXPORT SourceBufferStream {
   // end overlaps if necessary.
   // |deleted_buffers| is an output parameter containing candidates for
   // |track_buffer_|.
-  void InsertIntoExistingRange(
+  // Returns true if the buffers were successfully inserted into the existing
+  // range.
+  // Returns false if the buffers being inserted triggered an error.
+  bool InsertIntoExistingRange(
       const RangeList::iterator& range_for_new_buffers_itr,
       const BufferQueue& new_buffers,
       BufferQueue* deleted_buffers);