The new test added in bug 173960 fails on the perf bot: Running Layout/font-fallback-font-family.html (129 of 181) ERROR: CONSOLE MESSAGE: line 10: ReferenceError: Can't find variable: test FAILED Finished: 1.477668 s Myles, could you please take a look soon?
<rdar://problem/33645359>
This continues to make the perf bot red.
Committed r220502: <http://trac.webkit.org/changeset/220502>