Remove willReadDst from GrFragmentProcessor.

src/gpu/effects/GrCoverageSetOpXP.cpp

Index: src/gpu/effects/GrCoverageSetOpXP.cpp
diff --git a/src/gpu/effects/GrCoverageSetOpXP.cpp b/src/gpu/effects/GrCoverageSetOpXP.cpp
index bb87616e74472028cac3aeafdfd51ad92987dc18..fe286f6bf5ceef5e09ca05ea670d08a3126820d8 100644
--- a/src/gpu/effects/GrCoverageSetOpXP.cpp
+++ b/src/gpu/effects/GrCoverageSetOpXP.cpp
@@ -195,22 +195,13 @@ void GrCoverageSetOpXPFactory::getInvariantOutput(const GrProcOptInfo& colorPOI,
             output->fBlendedColorFlags = 0;
         }
 
-        if (coveragePOI.readsDst()) {
-            output->fWillBlendWithDst = true;
-        } else {
-            output->fWillBlendWithDst = false;
-        }
+        output->fWillBlendWithDst = false;
     } else {
         output->fBlendedColorFlags = 0;
         output->fWillBlendWithDst = true;
     }
 }
 
-bool GrCoverageSetOpXPFactory::willReadDst(const GrProcOptInfo& colorPOI,
-                                           const GrProcOptInfo& coveragePOI) const {
-    return coveragePOI.readsDst();
-}
-
 GR_DEFINE_XP_FACTORY_TEST(GrCoverageSetOpXPFactory);
 
 GrXPFactory* GrCoverageSetOpXPFactory::TestCreate(SkRandom* random,