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

include/gpu/effects/GrConstColorProcessor.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrColorProcessor_DEFINED
 #define GrColorProcessor_DEFINED
 
@@ skipping 18 matching lines @@
     static const int kInputModeCnt = kLastInputMode + 1;
 
     static GrFragmentProcessor* Create(GrColor color, InputMode mode) {
         return SkNEW_ARGS(GrConstColorProcessor, (color, mode));
     }
 
     ~GrConstColorProcessor() override {}
 
     const char* name() const override { return "Color"; }
 
-    GrGLFragmentProcessor* createGLInstance() const override;
-
     GrColor color() const { return fColor; }
 
     InputMode inputMode() const { return fMode; }
 
 private:
     GrConstColorProcessor(GrColor color, InputMode mode) : fColor(color), fMode(mode) {
         this->initClassID<GrConstColorProcessor>();
     }
 
+    GrGLFragmentProcessor* onCreateGLInstance() const override;
+
     void onGetGLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override;
 
     bool onIsEqual(const GrFragmentProcessor&) const override;
 
     void onComputeInvariantOutput(GrInvariantOutput* inout) const override;
 
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
 
     GrColor     fColor;
     InputMode   fMode;
 
     typedef GrFragmentProcessor INHERITED;
 };
 
 #endif