Determine whether we can tweakAlphaForCoverage during Pipeline/XP creation.

src/gpu/GrProcOptInfo.h

Index: src/gpu/GrProcOptInfo.h
diff --git a/src/gpu/GrProcOptInfo.h b/src/gpu/GrProcOptInfo.h
index 6e8f615d2c0204c5b5333707a7b000561d281096..059bca4dd8b8762b9879e95eb7c2d90844f0dd98 100644
--- a/src/gpu/GrProcOptInfo.h
+++ b/src/gpu/GrProcOptInfo.h
@@ -45,6 +45,7 @@ public:
     bool isSolidWhite() const { return fInOut.isSolidWhite(); }
     bool isOpaque() const { return fInOut.isOpaque(); }
     bool isSingleComponent() const { return fInOut.isSingleComponent(); }
+    bool allStagesMultiplyInput() const { return fInOut.allStagesMulInput(); }
 
     // TODO: Once texture pixel configs quaries are updated, we no longer need this function.
     // For now this function will correctly tell us if we are using LCD text or not and should only