[automerger] m4v_h263: add a test for invalid/negative value am: 7802c68a...

[automerger] m4v_h263: add a test for invalid/negative value am: 7802c68a am: 08aa2367 am: 644ad716 am: c9528234 am: ee98fbf5 am: e82c14f4 am: 3c1c45dd am: 4e314d91 am: b4466349 am: b3b559a8
am: 5146b355

Change-Id: I64159e81240d656773f479e8bef41d9b63d7670c