Disable blending when there is an effect that reads the dst and draw state blend is 1,0.

src/gpu/gl/GrGLProgramDesc.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLProgramDesc.h"
 #include "GrBackendEffectFactory.h"
 #include "GrDrawEffect.h"
@@ skipping 160 matching lines @@
             } else if (kSA_GrBlendCoeff == dstCoeff) {
                 // SA dst coeff becomes 1-(1-SA)*coverage when dst is partially covered.
                 desc->fCoverageOutput = kSecondaryCoverageISA_CoverageOutput;
                 desc->fFirstCoverageStage = firstCoverageStage;
             } else if (kSC_GrBlendCoeff == dstCoeff) {
                 // SA dst coeff becomes 1-(1-SA)*coverage when dst is partially covered.
                 desc->fCoverageOutput = kSecondaryCoverageISC_CoverageOutput;
                 desc->fFirstCoverageStage = firstCoverageStage;
             }
         } else if (readsDst &&
-                   kOne_GrBlendCoeff == drawState.getSrcBlendCoeff() &&
-                   kZero_GrBlendCoeff == drawState.getDstBlendCoeff()) {
+                   kOne_GrBlendCoeff == srcCoeff &&
+                   kZero_GrBlendCoeff == dstCoeff) {
             desc->fCoverageOutput = kCombineWithDst_CoverageOutput;
             desc->fFirstCoverageStage = firstCoverageStage;
         }
     }
 
     desc->fPositionAttributeIndex = drawState.positionAttributeIndex();
     desc->fLocalCoordAttributeIndex = drawState.localCoordAttributeIndex();
 
     // For constant color and coverage we need an attribute with an index beyond those already set
     int availableAttributeIndex = drawState.getVertexAttribCount();
     if (requiresColorAttrib) {
         desc->fColorAttributeIndex = drawState.colorVertexAttributeIndex();
     } else if (GrGLProgramDesc::kAttribute_ColorInput == desc->fColorInput) {
         GrAssert(availableAttributeIndex < GrDrawState::kMaxVertexAttribCnt);
         desc->fColorAttributeIndex = availableAttributeIndex;
         availableAttributeIndex++;
     } else {
         desc->fColorAttributeIndex = -1;
     }
 
     if (requiresCoverageAttrib) {
         desc->fCoverageAttributeIndex = drawState.coverageVertexAttributeIndex();
     } else if (GrGLProgramDesc::kAttribute_ColorInput == desc->fCoverageInput) {
         GrAssert(availableAttributeIndex < GrDrawState::kMaxVertexAttribCnt);
         desc->fCoverageAttributeIndex = availableAttributeIndex;
     } else {
         desc->fCoverageAttributeIndex = -1;
     }
 }