[graphite] Use a dst type enum in blenders' addToKey methods
This will allow us to account for surface reads in
SkRuntimeBlender::addToKey. Another option might be to
add another bool param alongside primitiveColorBlender.
Change-Id: Ib571f292ab5246f17e96ee192fa5f719c6968357
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/653676
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Nicolette Prevost <nicolettep@google.com>
Commit-Queue: James Godfrey-Kittle <jamesgk@google.com>
5 files changed