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Similarly to what we do for slot elements. When moving from a separate
re-attach where computing style as part of AttachLayoutTree to
RecalcStyle for re-attach we need to detect that we recalc style for
distributed nodes for re-attach to SetNonAttachedStyle(). Since we can't
really propagate the kReattach up from inside the shadow tree recalc to
the shadow host when recalculating light tree children, we recalculate
the distributed nodes from the insertion point when we are in a kReattach
change.

Bug: 873129, 873279
Change-Id: I2364c5f1dce3a79e725d3cb94750f1cfb3e98221
Reviewed-on: https://chromium-review.googlesource.com/1172424
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: Anders Ruud <andruud@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583200}