[Mac] Numerous webgl tests time out with WebM format reader enabled
Created attachment 416228 [details] Patch
Created attachment 416229 [details] Patch
Created attachment 416230 [details] Patch
Created attachment 416243 [details] Patch
Committed r270841: <https://trac.webkit.org/changeset/270841> All reviewed patches have been landed. Closing bug and clearing flags on attachment 416243 [details].
<rdar://problem/72343306>