LayoutTest media/modern-media-controls/scrubber-support/scrubber-support-drag.html is a flaky timeout https://build.webkit.org/results/Apple%20El%20Capitan%20Debug%20WK2%20(Tests)/r208496%20(9321)/results.html http://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=media%2Fmodern-media-controls%2Fscrubber-support%2Fscrubber-support-drag.html
Marked as flaky (or rather, added timeout to the list) in http://trac.webkit.org/projects/webkit/changeset/208512
Hasn't been an issue since turning modern media controls on by default.