Bug 1838748 [wpt PR 40577] - Allow button to have writing mode vertical, a=testonly

Bug 1838748 [wpt PR 40577] - Allow button to have writing mode vertical, a=testonly

Automatic update from web-platform-tests
Allow button to have writing mode vertical

This CL allows <button> and <input> types "button", "submit", "reset",
"file" to have writing-mode vertical for both the default native
appearance and when appearance is set to none.

We also put the change behind the feature flag
FormControlsVerticalWritingModeSupport so it can be turned on safely.

Change-Id: I1f6cc53a1eaef640e3d968d0e7ec5fc248879b50
Bug: 681917
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4617874
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: David Grogan <dgrogan@chromium.org>
Commit-Queue: Di Zhang <dizhangg@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1159261}

--

wpt-commits: 289e601bed8bd71bd29ae61c336b1281c35b33b2
wpt-pr: 40577