Support top layer animations on ::select-fallback-datalist
This patch makes :popover-open work on ::select-fallback-datalist and
fixes an issue with slotting which makes s disappear during exit
animations.
Fixed: 359279550
Change-Id: Ie9d8338699c0df9f37318d7a353fc7945456e4f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5791861
Reviewed-by: David Baron dbaron@chromium.org
Commit-Queue: David Baron dbaron@chromium.org
Cr-Commit-Position: refs/heads/main@{#1343143}