[graphite] Add sampling fallback since Graphite doesn't support anisotropic sampling

Bug: b/274807200
Change-Id: If4a26ee351476add1dce0c7f62b6515e97bbcda7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/660556
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed