Add a runtime effect gm for squircle clips

Change-Id: I6bf9cad2dd7095afbc153e90510dd0f7c398797d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/382936
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
1 file changed