Bug 1793048 [wpt PR 36143] - [anchor-position] Support anchors in an OOF in a multico...

Bug 1793048 [wpt PR 36143] - [anchor-position] Support anchors in an OOF in a multicol, a=testonly

Automatic update from web-platform-tests
[anchor-position] Support anchors in an OOF in a multicol

r1046800 crrev.com/c/3885596 supported anchors on OOF, but not
when anchors are in an OOF in a multicol. This patch supports
the scenario and removes the TODO comment.

Note, adding to |LayoutObject::Bitfields| expands the size of
the |LayoutObject|. This patch uses the same technique as
r1025608 crrev.com/c/3767050 to add a flag.

Bug: 1309178
Change-Id: I5fab7ad080586278394231a9cda3154a4a83c6fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3924822
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Auto-Submit: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1052762}

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wpt-commits: 7436b508cd7d1d4fba90302c1e82fce9761b627e
wpt-pr: 36143