Remove default implementation of GrEffect::isEqual. Make GrSingleTextureEffect abstract.
Review URL: https://codereview.appspot.com/7142049

git-svn-id: http://skia.googlecode.com/svn/trunk@7254 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/effects/GrConvolutionEffect.cpp b/src/gpu/effects/GrConvolutionEffect.cpp
index 1f4c094..82c908a 100644
--- a/src/gpu/effects/GrConvolutionEffect.cpp
+++ b/src/gpu/effects/GrConvolutionEffect.cpp
@@ -167,10 +167,9 @@
     return GrTBackendEffectFactory<GrConvolutionEffect>::getInstance();
 }
 
-bool GrConvolutionEffect::isEqual(const GrEffect& sBase) const {
-     const GrConvolutionEffect& s =
-        static_cast<const GrConvolutionEffect&>(sBase);
-    return (INHERITED::isEqual(sBase) &&
+bool GrConvolutionEffect::onIsEqual(const GrEffect& sBase) const {
+     const GrConvolutionEffect& s = static_cast<const GrConvolutionEffect&>(sBase);
+    return (this->texture(0) == s.texture(0) &&
             this->radius() == s.radius() &&
             this->direction() == s.direction() &&
             0 == memcmp(fKernel, s.fKernel, this->width() * sizeof(float)));