Patch forthcoming.
Created attachment 285182 [details] the patch
Landed in https://trac.webkit.org/changeset/204060
I forgot to ask but does this work with the extra tests environment variable?
(In reply to comment #3) > I forgot to ask but does this work with the extra tests environment variable? Yes. It's now additive. Previously it was destructive: --extra-tests would override the environment variable. Now you get the sum of the two.