Currently they are not hooked up correctly.
Pull request: https://github.com/WebKit/WebKit/pull/6646
*** Bug 248090 has been marked as a duplicate of this bug. ***
Committed 256857@main (c370224a221c): <https://commits.webkit.org/256857@main> Reviewed commits have been landed. Closing PR #6646 and removing active labels.
<rdar://problem/102532122>