The following layout test timed out on chromium. perf/show-hide-table-rows.html Probable cause: http://trac.webkit.org/changeset/94938
This appears no longer to be so: http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=perf%2Fshow-hide-table-rows.html (the slowest runs are now ca. 14s in debug). I'm just marking this as slow for both debug/release instead.
The test started failing periodically: https://bugs.webkit.org/show_bug.cgi?id=98400