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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}