Bug 1754583 [wpt PR 32786] - [GridFragmentation] Propagate break values from sub...

Bug 1754583 [wpt PR 32786] - [GridFragmentation] Propagate break values from sub-trees., a=testonly

Automatic update from web-platform-tests
[GridFragmentation] Propagate break values from sub-trees.

This patch builds on:
https://chromium-review.googlesource.com/c/chromium/src/+/3433832

...which introduced a flag to propagate break-before/break-after values
from un-fragmentated subtrees.

This patch sets the flag when we are doing the global placement of
grid-items. During this initial placement we were already reading
NGLayoutResult::InitialBreakBefore, and NGLayoutResult::FinalBreakAfter
correctly.

Bug: 614667
Change-Id: I052b92ce375ee2394ae27113cc4861abd5fc6bfc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3451161
Reviewed-by: Alison Maher <almaher@microsoft.com>
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/main@{#969564}

--

wpt-commits: 186026071faac499b208487dfa28ad1b9a14a9cf
wpt-pr: 32786