Merge "stagefright: MPEG4Extractor: allow \'hdlr\' box before first track" into klp-dev am: b1a13d01dc am: 781cd4f37d am: 8565726f57 am: b44e95da77
am: 699e9b0749

* commit '699e9b0749bda03d12d6aaea9632b28d2bd9e6fb':
  stagefright: MPEG4Extractor: allow 'hdlr' box before first track