Push isEqual/onIsEqual down from GrProcessor to subclasses.

src/gpu/effects/GrSimpleTextureEffect.h

Index: src/gpu/effects/GrSimpleTextureEffect.h
diff --git a/src/gpu/effects/GrSimpleTextureEffect.h b/src/gpu/effects/GrSimpleTextureEffect.h
index 88c5ca21a17e865123f70f0b7a21c418c2c194ee..565b1eadac4de5135dc8dfa05087d7b0de79b2b9 100644
--- a/src/gpu/effects/GrSimpleTextureEffect.h
+++ b/src/gpu/effects/GrSimpleTextureEffect.h
@@ -68,7 +68,7 @@ private:
         : GrSingleTextureEffect(texture, matrix, params, coordSet) {
     }
 
-    virtual bool onIsEqual(const GrProcessor& other) const SK_OVERRIDE {
+    virtual bool onIsEqual(const GrFragmentProcessor& other) const SK_OVERRIDE {
         const GrSimpleTextureEffect& ste = other.cast<GrSimpleTextureEffect>();
         return this->hasSameTextureParamsMatrixAndSourceCoords(ste);
     }