Move SkDraw to use SkVerticesPriv, remove redundant private API

Change-Id: I84117c64177b263ed99638d055eda484a1959534
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/280637
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
4 files changed