DO NOT MERGE MPEG4Extractor: ensure kKeyTrackID exists before creating an MPEG4Source as track. am: b016207fc2 am: e2ca751723
am: 3d1df4f411  -s ours

* commit '3d1df4f411a531fb30cc8563cb39e732041d22ad':
  DO NOT MERGE MPEG4Extractor: ensure kKeyTrackID exists before creating an MPEG4Source as track.

Change-Id: Id6ce35c59190c3d94129e8ec4c1f2aef108fa71a