maximalOutlineSize is dirty rect slop that doesn't need to accumulate error. It also derives its value from RenderView's value, which is already an integer.
Created attachment 139553 [details] Patch
Comment on attachment 139553 [details] Patch OK.
A new record!!!! 36 seconds!
Comment on attachment 139553 [details] Patch Clearing flags on attachment: 139553 Committed r115701: <http://trac.webkit.org/changeset/115701>
All reviewed patches have been landed. Closing bug.