This will allow making it a friend of classes in WebCore to help with generated serialization code, among other things.
Pull request: https://github.com/WebKit/WebKit/pull/3944
Committed 254114@main (d299ddbd30a7): <https://commits.webkit.org/254114@main> Reviewed commits have been landed. Closing PR #3944 and removing active labels.
<rdar://problem/99507466>