r253267 made active touchstart event listeners async by using deferring gesture recognizers the effectively "gate" all preventable native gestures until the web process has handled the touch. We should, in theory, be able to this infrastructure to touchend events as well.
<rdar://problem/64912551>
> We should, in theory, be able to this infrastructure to touchend events as > well. s/this infrastructure/extend this infrastructure/
Created attachment 417054 [details] WIP
Created attachment 417770 [details] Patch
Committed r271660: <https://trac.webkit.org/changeset/271660> All reviewed patches have been landed. Closing bug and clearing flags on attachment 417770 [details].