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Neighbours can clip to the same infinity. Using two of the same
vertex in a polygon can cause the computed normal to be (0,0,0),
which causes badness and failures.

BUG=626095
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2551263002
Cr-Commit-Position: refs/heads/master@{#443296}