http://tinderbox.mozilla.org/showlog.cgi?log=Mozilla-Inbound/1309778132.1309780780.18525.gz in the reference image there is no circle, that appears in the test
The test looks like what you'd expect if the animation hasn't run.
Created attachment 544830 [details] [diff] [review] patch Not a regression from the number-optional-number patch per-se as the DidAnimate call was missing even when it was implemented as two integers.
Created attachment 544845 [details] [diff] [review] hg changeset patch
Sent to try: http://tbpl.mozilla.org/?tree=Try&rev=266eddc1fb6f