Bug 1793070 [wpt PR 36108] - Add constraint space flag for being push…

…ed by floats., a=testonly

Automatic update from web-platform-tests
Add constraint space flag for being pushed by floats.

When clearance has already been applied in a previous layout pass (along
with resolving the BFC block-offset) that aborted, or if we apply
clearance before entering child layout at all, we won't be able to
detect this during child layout, since the BFC block-offset has already
been pushed down in the constraint space. We therefore need a flag. This
allows us to correctly identify class C breakpoints [1].

[1] https://www.w3.org/TR/css-break-3/#possible-breaks

Set this flag before entering layout when we have pre-applied clearance.
There are two different locations that do this. Added one test for each.

Bug: 1366263
Change-Id: I84e4c01276fe035720cdc7e6d626fcfaf247f414
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3921635
Reviewed-by: Ian Kilpatrick <ikilpatrickchromium.org>
Commit-Queue: Morten Stenshorne <mstenshochromium.org>
Cr-Commit-Position: refs/heads/main{#1053208}

--

wpt-commits: e215f48ec622a89e2306ff3276c918ae58d6516d
wpt-pr: 36108

UltraBlame original commit: 784d98fa18f8a8f6a019080cc036638e196683a2

testing/web-platform/tests/css/css-break/class-c-breakpoint-after-float-000.html

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