Layout test fast/layers/no-clipping-overflow-hidden-added-after-transform.html is a flaky failure on mac-wk2 EWS bots, but it does not appear to be flaky on trunk bots. https://webkit-queues.webkit.org/results/9994133 https://webkit-queues.webkit.org/results/9994114 https://webkit-queues.webkit.org/results/9993947 https://webkit-queues.webkit.org/results/9993837
This test is known to be flaky on mac-wk1: https://bugs.webkit.org/show_bug.cgi?id=157007 https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#tests=fast%2Flayers%2Fno-clipping-overflow-hidden-added-after-transform.html
Marked test as flaky on Sierra Release WK2 to mitigate the retries on EWS: https://trac.webkit.org/r238207