[GridFragmentation] Propagate child break values follow-up

As a follow-up to CL:3451309 and CL:3451161, add a call to
SetShouldPropagateChildBreakValues() in the ConstraintSpaceBuilder
so that if the parent space has this flag set, the child will too.

This means that we are propagating these values on all layout
runs inside a fragmentation context root (even if
SetupSpaceBuilderForFragmentation() isn't called.)

However, this allows us to propagate break values in grid (and flex)
past the immediate child level in the non-fragmenting layout pass.

external/wpt/css/css-break/grid/grid-item-fragmentation-045.html
was updated to add an extra layer of propagation to ensure that
we are correctly propagating past the first child level for grid.

Bug: 614667
Change-Id: Ie7323a565a4183d6cf36d58e33fa6d60029913ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3465477
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Alison Maher <almaher@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#971929}

css/css-break/grid/grid-item-fragmentation-045.html

@@ -6,7 +6,9 @@
 <div style="position: relative; width: 100px; height: 100px; columns: 2; column-gap: 0; column-fill: auto; background: red;">
   <div style="display: grid; grid-template-rows: 50px 100px;">
     <div style="background: green; break-after: avoid;">
-      <div style="break-after: column;"></div> <!-- This break-after should be propagated to the grid row. -->
+      <div>
+        <div style="break-after: column;"></div> <!-- This break-after should be propagated to the grid row. -->
+      </div>
     </div>
     <div style="background: green;">
     </div>