The perf dashboard should have the capability to schedule an A/B testing job with a custom darwinup root.
<rdar://problem/30341422>
Created attachment 306729 [details] Patch
Committed r215202: <http://trac.webkit.org/changeset/215202>
Re-opened since this is blocked by bug 170694
Committed r215205: <http://trac.webkit.org/changeset/215205>