Changes for bug 145126 made it so Document::updateHoverActiveState() always called updateStyleIfNeeded(). For iOS, we would prefer to not have style recall be synchronous. Deferring the style recalc to the regular timer results in better scrolling on some web pages.
Created attachment 210498 [details]
(In reply to comment #0)
> Changes for bug 145126
That should have been bug 98168. The change was r145126.
Committed r155071: <http://trac.webkit.org/changeset/155071>