Use shader based blending to clamp kPlus mode w/F16

Bug: skia:6173
Change-Id: I21042d484d9a7b3eee04aa3301d9793d00ad6908
Reviewed-on: https://skia-review.googlesource.com/48183
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/src/gpu/GrProcessorSet.h b/src/gpu/GrProcessorSet.h
index 05d0a59..b61980b 100644
--- a/src/gpu/GrProcessorSet.h
+++ b/src/gpu/GrProcessorSet.h
@@ -141,7 +141,8 @@
      */
     Analysis finalize(const GrProcessorAnalysisColor& colorInput,
                       const GrProcessorAnalysisCoverage coverageInput, const GrAppliedClip*,
-                      bool isMixedSamples, const GrCaps&, GrColor* inputColorOverride);
+                      bool isMixedSamples, const GrCaps&, GrPixelConfigIsClamped,
+                      GrColor* inputColorOverride);
 
     bool isFinalized() const { return SkToBool(kFinalized_Flag & fFlags); }