Usage of allWorkletGlobalScopesSet() in WorkletGlobalScope is not thread-safe.
Created attachment 412818 [details] Patch
Created attachment 412819 [details] Patch
Comment on attachment 412819 [details] Patch r=me
Found 2 new test failures: fast/css-custom-paint/constructor.html, fast/css-custom-paint/leaks.html
Created attachment 412833 [details] Patch
Committed r269221: <https://trac.webkit.org/changeset/269221> All reviewed patches have been landed. Closing bug and clearing flags on attachment 412833 [details].
<rdar://problem/70910590>