[mathml] Make math display values on non-MathML elements compute to flow #25483
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This CL aligns with a recent resolution from the CSSWG:
w3c/csswg-drafts#5385 (comment)
This also ensures that LayoutObjectFactory::CreateMath always receives
a MathML element.
The new test fails when MathML Core (in particular LayoutNG) is
disabled because math display values are not supported. Subtests fail
when MathML Core is enabled because multiple display values are not
supported.
Bug: 1127222, 6606
Change-Id: Ica5558f221960d0f80609dfe0e56c029de7e9c3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404789
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Frédéric Wang <fwang@igalia.com>
Cr-Commit-Position: refs/heads/master@{#806578}