Reland "Convert GrDitherEffect to a runtime FP"

This reverts commit 3dd52c758b6cbcf1bf6eca1d0a594195e770d2ef.

Change-Id: Ie873ad570ffc57b3edd6ffe8612cbc2c73d40450
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/424259
Reviewed-by: Brian Osman <brianosman@google.com>
13 files changed