The test at imported/blink/transitions/zero-duration-should-not-cancel.html does not work with the new animation engine, due to an issue with transition interruptions. We always interrupt transitions for a previously transitioning property if a new transition for that same property would have any of its timing or target values be different. This is a bug.
<rdar://problem/39397478>
This bug is no longer relevant, this test has a PASS expectation and the bots show only PASS results (see https://results.webkit.org/?suite=layout-tests&test=imported%2Fblink%2Ftransitions%2Fzero-duration-should-not-cancel.html).