Consolidate aa resolution for per-edge aa quads

Bug: skia:
Change-Id: I5c8f0c6bf3178c2fd623eb3d9779a9382ca40747
Reviewed-on: https://skia-review.googlesource.com/c/163483
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
3 files changed