Added tree structure to GrGLFragmentProcessor, i.e. GL instances

src/gpu/effects/GrDitherEffect.cpp

Index: src/gpu/effects/GrDitherEffect.cpp
diff --git a/src/gpu/effects/GrDitherEffect.cpp b/src/gpu/effects/GrDitherEffect.cpp
index 6d394506314fac12e9581b7a4188d3785288373a..2b10ac0080e1d2e9cd13c6aa7e46311d82a44acc 100644
--- a/src/gpu/effects/GrDitherEffect.cpp
+++ b/src/gpu/effects/GrDitherEffect.cpp
@@ -25,14 +25,14 @@ public:
 
     const char* name() const override { return "Dither"; }
 
-    GrGLFragmentProcessor* createGLInstance() const override;
-
 private:
     DitherEffect() {
         this->initClassID<DitherEffect>();
         this->setWillReadFragmentPosition();
     }
 
+    GrGLFragmentProcessor* onCreateGLInstance() const override;
+
     void onGetGLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override;
 
     // All dither effects are equal
@@ -97,7 +97,7 @@ void DitherEffect::onGetGLProcessorKey(const GrGLSLCaps& caps,
     GLDitherEffect::GenKey(*this, caps, b);
 }
 
-GrGLFragmentProcessor* DitherEffect::createGLInstance() const  {
+GrGLFragmentProcessor* DitherEffect::onCreateGLInstance() const  {
     return SkNEW_ARGS(GLDitherEffect, (*this));
 }