The fast/css/text-overflow-ellipsis-full-truncate-rtl.html reftest test is failing since introduced in r150065. http://trac.webkit.org/changeset/150065 http://webkit-test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=fast%2Fcss%2Ftext-overflow-ellipsis-full-truncate-rtl.html
Fixed in r221974.