NG/DL: Implement size containment (and display lock) for NG fieldset algo #16858
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This patch adds size containment implementation for fieldsets in
LayoutNG.
Tested with LayoutNGFieldset feature flag.
Along with the new tests,
external/wpt/css/css-contain/contain-size-fieldset-001.html and
external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/contain/contain-size-fieldset-001.html
are also passing.
R=chrishtr@chromium.org, ikilpatrick@chromium.org, mstensho@chromium.org
Bug: 958975
Change-Id: I5e735adc65ed9450f84e4c1ab68cba69e3fd85ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1613844
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: vmpstr <vmpstr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660866}