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

include/gpu/effects/GrConstColorProcessor.h

Index: include/gpu/effects/GrConstColorProcessor.h
diff --git a/include/gpu/effects/GrConstColorProcessor.h b/include/gpu/effects/GrConstColorProcessor.h
index 4ceb2394e05fc64b8147dabf5aa55c5f39d616c4..505c1b3330382fb77639fbe89f144d3fbf789753 100644
--- a/include/gpu/effects/GrConstColorProcessor.h
+++ b/include/gpu/effects/GrConstColorProcessor.h
@@ -36,8 +36,6 @@ public:
 
     const char* name() const override { return "Color"; }
 
-    GrGLFragmentProcessor* createGLInstance() const override;
-
     GrColor color() const { return fColor; }
 
     InputMode inputMode() const { return fMode; }
@@ -47,6 +45,8 @@ private:
         this->initClassID<GrConstColorProcessor>();
     }
 
+    GrGLFragmentProcessor* onCreateGLInstance() const override;
+
     void onGetGLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override;
 
     bool onIsEqual(const GrFragmentProcessor&) const override;