Determine the WheelScrollGestureState on the main thread before passing it to ScrollingCoordinator
Created attachment 415274 [details] Patch
Created attachment 415275 [details] Patch
Created attachment 415277 [details] Patch
Committed r270389: <https://trac.webkit.org/changeset/270389> All reviewed patches have been landed. Closing bug and clearing flags on attachment 415277 [details].
<rdar://problem/71927104>