Push isEqual/onIsEqual down from GrProcessor to subclasses.

src/effects/SkColorMatrixFilter.cpp

Index: src/effects/SkColorMatrixFilter.cpp
diff --git a/src/effects/SkColorMatrixFilter.cpp b/src/effects/SkColorMatrixFilter.cpp
index b3b861a82dd964e31958709ffaedc26bc1c49937..ee6de61f0acfdebed8ee9ca5d6a65bc35700a1e6 100644
--- a/src/effects/SkColorMatrixFilter.cpp
+++ b/src/effects/SkColorMatrixFilter.cpp
@@ -421,7 +421,7 @@ public:
 private:
     ColorMatrixEffect(const SkColorMatrix& matrix) : fMatrix(matrix) {}
 
-    virtual bool onIsEqual(const GrProcessor& s) const {
+    virtual bool onIsEqual(const GrFragmentProcessor& s) const {
         const ColorMatrixEffect& cme = s.cast<ColorMatrixEffect>();
         return cme.fMatrix == fMatrix;
     }