This passes, but occasionally outputs to the console. Some other offscreen-canvas tests seem to be doing the same as well - I expect these failures will disappear once we start implementing more of OffscreenCanvas (particularly in workers), but until then we should redirect the console output so these tests don't register as failures.
Created attachment 380615 [details] Patch
Comment on attachment 380615 [details] Patch Clearing flags on attachment: 380615 Committed r250968: <https://trac.webkit.org/changeset/250968>
All reviewed patches have been landed. Closing bug.
<rdar://problem/56155414>