Merge "stagefright: MPEG4Extractor: allow \'hdlr\' box before first track" into klp-dev am: b1a13d01dc am: 781cd4f37d am: 8565726f57 am: b44e95da77 am: 699e9b0749 am: 8e4f53159c
am: 8fbf202f7b

* commit '8fbf202f7b9fa461f07b49470c2a6afe39ca6afd':
  stagefright: MPEG4Extractor: allow 'hdlr' box before first track