Add unit tests for src=dst in SkGeometry

Bug: skia:
Change-Id: Iee0beaa187898f01983f5cb7297d8b515e47103a
Reviewed-on: https://skia-review.googlesource.com/146926
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
1 file changed