Backport MediaCodec-based test to StagefrighTest am: 97bc3d30ab  -s ours am: 8f6bd7da62 am: c2b3b67a55  -s ours am: c24466a6b4 am: 232475755a am: e9dfe506c5
am: 8699feed37

Change-Id: Ie7df6be12a2ace1565045d810bc3f3337753bd2f