1. Call UpdateStyleAndLayoutTree from IsAppearanceBaseButton and
IsAppearanceBasePicker, unless no_update is set for cases which are
calling from within a style/layout recalc.
2. Call EnsureComputedStyle when checking IsAppearanceBasePicker in
order to get an appearance value despite the element being
display:none due to it being a closed popover.
Since the picker might no longer have a computed style all the time,
this requires rewriting some accessibility code which was depending on
always having a computed style for the picker. I rewrote the
accessibility code to be more consistent across appearance:base-select
mode and appearance:auto mode by consistently using the UA popover
element as the MenuListPopup mapped element.
Bug: 364348901
Fixed: 364924715
Change-Id: I3fec57f2e02ce4200c95c256e5c1072b5c21ef8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5953628
Reviewed-by: David Baron <dbaron@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: David Baron <dbaron@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1399296}
2313906f2c