This bug already reported at webkit.org/b/148470. But many tests skip in webkit.org/b/148470 not only tests which is caused by r188793 also others. So I make the new bug to fix the tests related with the UI events.
I prefer fixing the event regression in the original bug - bug148470. If there were unrelated tests skipped in that bug, it isn't good at all. We need separated bug report(s) for these skipped tests. *** This bug has been marked as a duplicate of bug 148470 ***