This was originally present to control filter mode, and was never
removed when filtering decisions were placed on the SkShader.
Change-Id: I2b91f02f994c508fd986cd1b3e28fa97f15d8469
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/536496
Reviewed-by: Jorge Betancourt <jmbetancourt@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>