We'll need to use DisplayLink in a way that doesn't involve IPC (for UI-side compositing), so make it a little more generic by using IPC::Connection::UniqueID rather than IPC::Connection.
<rdar://problem/101014516>
Pull request: https://github.com/WebKit/WebKit/pull/5226
Committed 255404@main (21ff04706f4f): <https://commits.webkit.org/255404@main> Reviewed commits have been landed. Closing PR #5226 and removing active labels.