Bug 1760603 [wpt PR 33284] - Check writing direction when painting column rules....

Bug 1760603 [wpt PR 33284] - Check writing direction when painting column rules., a=testonly

Automatic update from web-platform-tests
Check writing direction when painting column rules.

Rather than deducing it from the column offsets relatively to each
other, use computed style to check writing-mode and direction.

We'd fail a DCHECK if we ended up with saturated LayoutUnit values for
vertical-rl multicol containers (because we'd incorrectly think that
writing mode was horizontal).

Bug: 1308191
Change-Id: I3029d66949188bc149bf15ca9c709ec6ad105c68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3540360
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/main@{#983741}

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wpt-commits: fdae5a3dc97ed6f6570772bd5eebd8b3ff853213
wpt-pr: 33284