Created attachment 372328 [details]
Before this patch, I ran 30 iterations of these tests locally and saw success rates of 21/30 and 25/30. With this patch, I've run 200 iterations (so far) and haven't seen any failures of either.
Comment on attachment 372328 [details]
Clearing flags on attachment: 372328
Committed r246548: <https://trac.webkit.org/changeset/246548>
All reviewed patches have been landed. Closing bug.