Determine whether we can tweakAlphaForCoverage during Pipeline/XP creation.

src/gpu/GrProcOptInfo.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrProcOptInfo_DEFINED
 #define GrProcOptInfo_DEFINED
 
@@ skipping 27 matching lines @@
     void calcCoverageWithBatch(const GrBatch*, const GrFragmentStage*, int stagecount);
 
     // TODO delete these when batch is everywhere
     void calcColorWithPrimProc(const GrPrimitiveProcessor*, const GrFragmentStage*, int stagecount);
     void calcCoverageWithPrimProc(const GrPrimitiveProcessor*, const GrFragmentStage*,
                                   int stagecount);
 
     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
     // be called when looking at the coverage output.
     bool isFourChannelOutput() const { return !fInOut.isSingleComponent() &&
                                                fInOut.isLCDCoverage(); }
 
     GrColor color() const { return fInOut.color(); }
     uint8_t validFlags() const { return fInOut.validFlags(); }
 
@@ skipping 29 matching lines @@
     void internalCalc(const GrFragmentStage*, int stagecount, bool initWillReadFragPosition);
 
     GrInvariantOutput fInOut;
     int fFirstEffectStageIndex;
     bool fInputColorIsUsed;
     GrColor fInputColor;
     bool fReadsFragPosition;
 };
 
 #endif