media/W3C/video/events/event_order_canplay_canplaythrough.html Test is a flaky timeout according to history on macOS Catalina wk2 Debug. First occurrence of a timeout is at r259212 but no indication revision is cause. History: https://results.webkit.org/?suite=layout-tests&test=media%2FW3C%2Fvideo%2Fevents%2Fevent_order_canplay_canplaythrough.html&platform=mac&version_name=Catalina&style=debug&flavor=wk2&limit=50000 Diff: Timeout
<rdar://problem/67739622>
Test expectation while investigated: https://trac.webkit.org/changeset/266115/webkit