The following layout test is always timing out on all Mac bots: mathml/very-large-stretchy-operators.html It's been always failing since landing. http://webkit-test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=mathml%2Fvery-large-stretchy-operators.html
> all Mac bots Sorry, debug ones only.
Skipped in r157086. Please investigate this - it looks like the test is perfectly fast in release, so timing out in debug could be a bad sign.
This is a performance test for very large MathML stretchy operators. Before the patch, this froze the browser in release builds. I have not investigated but I'm guessing it is OK to skip this test in debug builds.
Hopefully this will be resolved now that Bug 155434 is closed.