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

src/gpu/effects/GrConvolutionEffect.h

Index: src/gpu/effects/GrConvolutionEffect.h
diff --git a/src/gpu/effects/GrConvolutionEffect.h b/src/gpu/effects/GrConvolutionEffect.h
index e65c4c43c94d4e2341d7dd0489048bf791087398..37faa0892472cd78ec498afe7ea2f69575e59455 100644
--- a/src/gpu/effects/GrConvolutionEffect.h
+++ b/src/gpu/effects/GrConvolutionEffect.h
@@ -63,8 +63,6 @@ public:
 
     const char* name() const override { return "Convolution"; }
 
-    GrGLFragmentProcessor* createGLInstance() const override;
-
     enum {
         // This was decided based on the min allowed value for the max texture
         // samples per fragment program run in DX9SM2 (32). A sigma param of 4.0
@@ -98,6 +96,8 @@ private:
                         bool useBounds,
                         float bounds[2]);
 
+    GrGLFragmentProcessor* onCreateGLInstance() const override;
+
     void onGetGLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override;
 
     bool onIsEqual(const GrFragmentProcessor&) const override;