align-items should be a discrete animatable property
<rdar://problem/71012428>
Created attachment 413107 [details] Patch
Created attachment 413109 [details] Patch
Comment on attachment 413109 [details] Patch Please don't land this until next week.
Committed r269357: <https://trac.webkit.org/changeset/269357> All reviewed patches have been landed. Closing bug and clearing flags on attachment 413109 [details].
Nice!