`eventSender.monitorWheelEvents()` needs to update state in the UI process with UI-side compositing.
<rdar://problem/103434051>
Pull request: https://github.com/WebKit/WebKit/pull/7734
Committed 258002@main (e505e7f1c203): <https://commits.webkit.org/258002@main> Reviewed commits have been landed. Closing PR #7734 and removing active labels.