[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: 2212b8ec
am: 6cfb4349

Change-Id: I1582b8de97956d9512790be9fe7f3c7c540f4c1f