LayoutTest fast/images/animated-gif-scrolling-crash.html is a flaky timeout https://build.webkit.org/builders/Apple%20El%20Capitan%20Debug%20WK1%20(Tests)/builds/2888 https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Fimages%2Fanimated-gif-scrolling-crash.html
Marked test as flaky in https://trac.webkit.org/changeset/220763/webkit