Use explicit sampling in SkDraw

... on our way to adding the parameter to SkDevice

Bug: skia:7650
Change-Id: Iebde07e747741dfb47888426210bf2f231f295aa
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/345418
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
7 files changed