Generate serialization for PKContact
<rdar://problem/119407339>
Pull request: https://github.com/WebKit/WebKit/pull/21543
Committed 271807@main (22afd2ad4c4e): <https://commits.webkit.org/271807@main> Reviewed commits have been landed. Closing PR #21543 and removing active labels.
Re-opening for pull request https://github.com/WebKit/WebKit/pull/21580
Committed 271820@main (55045fd24d22): <https://commits.webkit.org/271820@main> Reviewed commits have been landed. Closing PR #21580 and removing active labels.