We are pretty comfy exposing this set for the long-term.
CanvasKit will generally support chains of image filters,
not necessarily arbitrary DAGs, just to simplify the
points needed to expose.
Change the naming around MaskFilters also, I like having
the factories be a class function, just to keep things
a bit better organized and minimize the amount of things
we want to keep on the top level CanvasKit object.
Change-Id: If32c630efa2fd8bc4bac84d0c3461ac3c0d21263
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/250758
Reviewed-by: Robert Phillips <robertphillips@google.com>
15b40236bd