Fails on all Mac bots: -left:PASS, webkitTransform:PASS +left:FAIL(was:180.36349487304688, s/b:150), webkitTransform:FAIL(was: 140.12278747558594, s/b:50) or -left:PASS, webkitTransform:PASS +left:PASS, webkitTransform:FAIL(was: 259.1645812988281, s/b:50) or -left:PASS, webkitTransform:PASS +left:FAIL(was:450, s/b:150), webkitTransform:FAIL(was: 400, s/b:50)
Marked as flaky in <http://trac.webkit.org/r167331>.