Add new proxy-based DetermineDomainMode w/ test

split out of: https://skia-review.googlesource.com/c/8823/ (Remove GrFragmentProcessor-derived class' GrTexture-based ctors)


Change-Id: Ibf54da589710382254b416e4801d83e9f5663f44
Reviewed-on: https://skia-review.googlesource.com/10180
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
4 files changed