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

* commit 'b44e95da772bb26fa9fc4cdc04cf51b7d42344ae':
  stagefright: MPEG4Extractor: allow 'hdlr' box before first track