Remove legacy support for inheriting sampling from the paint.

A follow-up CL can remove the filter-quality from onProgram.

Change-Id: I770e3b1fd0907bf3824ed402502fa67325a433d5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/381799
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
12 files changed