Preconnect to link's target on click, for reduced page load time.
Created attachment 442166 [details] Patch
Seems like a reasonable analog to the existing preconnect in WebPageProxy::loadRequest.
Created attachment 442178 [details] Patch
Created attachment 442198 [details] Patch
Committed r284730 (243442@main): <https://commits.webkit.org/243442@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 442198 [details].
<rdar://problem/84570015>
Follow-up fix in Bug 232668.