We should support supplying extra data to the Notification constructor and retrieving it later, as outlined here: https://notifications.spec.whatwg.org/#dom-notification-data
<rdar://92677257>
Pull request: https://github.com/WebKit/WebKit/pull/540
Committed r293921 (250368@main): <https://commits.webkit.org/250368@main> Reviewed commits have been landed. Closing PR #540 and removing active labels.
imported/w3c/web-platform-tests/notifications/idlharness.https.any.html probably needs a WK1 rebase.
Committed r294061 (250465@trunk): <https://commits.webkit.org/250465@trunk>