The calls to `MockPageOverlayClient::drawRect()` happen in unpredictable order, so logging from here is a good way to have flakey tests.
<rdar://problem/104407435>
Pull request: https://github.com/WebKit/WebKit/pull/8812
Committed 259098@main (ae45341c029b): <https://commits.webkit.org/259098@main> Reviewed commits have been landed. Closing PR #8812 and removing active labels.