Merge "stagefright: MPEG4Extractor: allow \'hdlr\' box before first track" into klp-dev am: b1a13d01dc
am: 781cd4f37d

* commit '781cd4f37d4b81a8e5af45a3ba6cdd4cdd209a3e':
  stagefright: MPEG4Extractor: allow 'hdlr' box before first track