GrTessellator (AA): implement fast path for removing non-boundary edges.

Instead of using a full tessellate() pass, which allocates Polys,
MonotonePolys, etc. It's faster to simply accumulate the winding number
in the left-adjacent edge, and use that to remove non-boundary edges
(edges for which apply_fill_type() returns the same value on either
side of the edge).

This gives ~4-5% boost on MotionMark Fill Shapes.

Change-Id: I66bd4248ace01a8c35abd99519f4c455f936e5e5
Reviewed-on: https://skia-review.googlesource.com/8782
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Stephen White <senorblanco@chromium.org>

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