[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

Change-Id: Ib17d53405edeee752691fd661a89d685aa597a10