We're currently moving the contents of |flushers| into BackingStoreFlusher::create before we check if we have any, so didPaintLayers never gets called.
Pull request: https://github.com/WebKit/WebKit/pull/3792
<rdar://98521353>
Committed 254201@main (caf77f485fe2): <https://commits.webkit.org/254201@main> Reviewed commits have been landed. Closing PR #3792 and removing active labels.