LayoutTest media/modern-media-controls/media-controller/media-controller-auto-hide-mouse-enter-and-mouse-leave.html is a flaky timeout https://build.webkit.org/builders/Apple%20Sierra%20Release%20WK2%20(Tests)/builds/63 https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=media%2Fmodern-media-controls%2Fmedia-controller%2Fmedia-controller-auto-hide-mouse-enter-and-mouse-leave.html
Marked test as flaky in http://trac.webkit.org/projects/webkit/changeset/216639