stagefright: MP4Extractor: allow 10% overhead on default sample size am: a27317ab45 am: 268c480035 am: 87ce4202df am: d8c0785a36 am: fed97f38c2
am: 44f4c4d388

Change-Id: I966847464c1c7ad9d47dcc3e11de14252e29a0ab