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This is a reland of 5cae37b5

Two tests that were changed from Failure to Crash turned out
to be flaky, they do not crash on linux-xenial-rel.
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/linux-xenial-rel/3698

Original change's description:
> [LayoutNG] Make constraint space for column balancing intermediate
>
> Fragment caching and paint needs to know if fragments created
> for a constraint space are for the regular layout that are to
> be painted, or it's for intermediate computation.
>
> Since the layout results for column balancing should not be
> painted, this patch marks so.
>
> This change alone doesn't fix all weird paint data
> inconsistencies when block fragmentation is turned on. Other
> issues need further investigation.
>
> Bug: 714962
> Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
> Change-Id: I14d44ca10fd23726f2c08be45b10c2b0abe16bf7
> Reviewed-on: https://chromium-review.googlesource.com/1250685
> Commit-Queue: Koji Ishii <kojii@chromium.org>
> Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#595051}

TBR=mstensho@chromium.org

Bug: 714962, 890326
Change-Id: I3ed406ee0ab34f63e3c5b6a7352dac44274014f9
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Reviewed-on: https://chromium-review.googlesource.com/1251682Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595159}