Simplify paint construction slightly

Working to remove some of the specialized SkPaintToGrPaintXXX methods.

Bug: skia:11942
Change-Id: I6069319f2b3fa7131cac39f17bc7bc1bd994241f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/456959
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
3 files changed