Revert[6] "replace SkXfermode obj with SkBlendMode enum in paints"

- perform version check in CreateProc for XfermodeImageFilter and ArithmeticImageFilter
This reverts commit 3ed485f4249e17abb4b11f5018d03175fd1afb44.

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2992

Change-Id: Ib4a154cdd5f5d1dcac921ef50d53b79a2d6a1be8
Reviewed-on: https://skia-review.googlesource.com/2992
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
139 files changed