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For fragmentation, if we have a break token, the inline coordinate
may still be non-zero at the start of a next fragmentainer, if the
block we're fragmenting has an inline-start margin.
Furthermore, even the block coordinate may be non-zero, if
clearance has been applied.

R=cbiesinger@chromium.org

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: I998eabbbc2434574aff2e63dc7114f942c3c92c3
Reviewed-on: https://chromium-review.googlesource.com/799970
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Reviewed-by: Christian Biesinger <cbiesinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520777}