[layout] Don't allow non-formatting-context to be relayout-roots. #27710
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As lots of state can be passed from a non-fc to its sibling, treating
these as formatting context roots is incorrect for lots of edge cases.
This patch dis-allows non-fcs to be relayout-roots.
Change-Id: Ieef1a2ad1d653bd954a8a9989aecc8ac83107f69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2707136
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#856317}