Add shader based blending of kPlus for configs that need clamping

This effectively reverts https://skia-review.googlesource.com/c/skia/+/140500
and relands https://skia-review.googlesource.com/c/skia/+/48183.

Bug: skia:8871
Change-Id: I6b1d5daa3d319e0c078e553926ed9166cca9a24a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/199930
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/ccpr/GrCCPerFlushResources.cpp b/src/gpu/ccpr/GrCCPerFlushResources.cpp
index e3c4ad4..18d3ee9 100644
--- a/src/gpu/ccpr/GrCCPerFlushResources.cpp
+++ b/src/gpu/ccpr/GrCCPerFlushResources.cpp
@@ -31,7 +31,8 @@
 class AtlasOp : public GrDrawOp {
 public:
     FixedFunctionFlags fixedFunctionFlags() const override { return FixedFunctionFlags::kNone; }
-    GrProcessorSet::Analysis finalize(const GrCaps&, const GrAppliedClip*, GrFSAAType) override {
+    GrProcessorSet::Analysis finalize(
+            const GrCaps&, const GrAppliedClip*, GrFSAAType, GrClampType) override {
         return GrProcessorSet::EmptySetAnalysis();
     }
     CombineResult onCombineIfPossible(GrOp* other, const GrCaps&) override {