SkRegion to use pathbuilder

Change-Id: I542bcdb8bb7d4a03a10d23e7adad82aca94ad1ff
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1016456
Reviewed-by: Daniel Dilan <danieldilan@google.com>
Commit-Queue: Mike Reed <mike@reedtribe.org>
Reviewed-by: Florin Malita <fmalita@google.com>
11 files changed