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This enables a fast-path in Skia's AAConvexPathRenderer for paths that
only have lines (no higher order curves).

Change-Id: I0222d572f7679a270f6634bfc326a145dd6a7bed
Reviewed-on: https://chromium-review.googlesource.com/c/1334230Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>
Cr-Commit-Position: refs/heads/master@{#608001}