Many layout tests timeout after r191673.
I'll try and take a look now. My bet is that the Timer does not fire for some reason. Worse case scenario, we could keep calling callOnMainThread() instead of using a Timer for !PLATFORM(COCOA).
Created attachment 264299 [details] Patch
Comment on attachment 264299 [details] Patch rs=me.
Comment on attachment 264299 [details] Patch Clearing flags on attachment: 264299 Committed r191720: <http://trac.webkit.org/changeset/191720>
All reviewed patches have been landed. Closing bug.