The test is flaky on release build.
Created attachment 362959 [details] Patch
Created attachment 363013 [details] Patch
Comment on attachment 363013 [details] Patch r=me
Created attachment 363014 [details] Patch
Created attachment 363026 [details] Patch for landing
Comment on attachment 363026 [details] Patch for landing Clearing flags on attachment: 363026 Committed r242110: <https://trac.webkit.org/changeset/242110>
All reviewed patches have been landed. Closing bug.
<rdar://problem/48418337>