Tests using UIHelper.startMonitoringWheelEvents() still time out after 258483@main and 258549@main because waiting for a rendering update in the web process before dispatching wheel events it not enough; need to wait for the UI process to commit the transaction that enables the wheel event monitor.
<rdar://problem/103974484>
Pull request: https://github.com/WebKit/WebKit/pull/8339
Committed 258670@main (0b9475d56e42): <https://commits.webkit.org/258670@main> Reviewed commits have been landed. Closing PR #8339 and removing active labels.