SkPath::addPath(... SkPath::kExtend_AddPathMode) duplicates
the last point if the added path first point is the same,
resulting in:
path.xVerbTo(..., pt);
path.lineTo(pt);
The extra point has no effect in filling or stroking.
Pathops uses extend mode a lot; fixing this avoids
the output of Op() and Simplify() requiring another pass
through Simplify() to reduce the path to its minimum.
R=reed@google.com,robertphillips@google.com
Bug: skia:8227
Change-Id: I7d660b6dc45e37221abf351dd291b90c303943ec
Reviewed-on: https://skia-review.googlesource.com/147810
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Cary Clark <caryclark@skia.org>
54ff302cdc