Revert "Revert "replace Arithmetic xfermode with imagefilter""

This reverts commit 10ff5bfa789b6b602464e8511fdf676c6f5b1bd4.

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2680
TBR=
Change-Id: Iac2f4d48d227ff426ccf02b7eae280f382ad3580
Reviewed-on: https://skia-review.googlesource.com/2680
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
12 files changed