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

* commit 'b1a13d01dccbc48ea54aeb4a4ba7fce636ff1daa':
  stagefright: MPEG4Extractor: allow 'hdlr' box before first track