We observe sync IPC inside screenX and screenY during Speedometer 3's perf dashboard suite.
rdar://problem/115518949
Pull request: https://github.com/WebKit/WebKit/pull/19583
Committed 269839@main (3f0feeb141ba): <https://commits.webkit.org/269839@main> Reviewed commits have been landed. Closing PR #19583 and removing active labels.