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

src/gpu/effects/GrTextureDomain.h

Index: src/gpu/effects/GrTextureDomain.h
diff --git a/src/gpu/effects/GrTextureDomain.h b/src/gpu/effects/GrTextureDomain.h
index 7cf75d6c2545eeacadb2e8002e6f34bd3c63b675..a2e6652e91cf91823cbe167104e4c9f62ab0bbad 100644
--- a/src/gpu/effects/GrTextureDomain.h
+++ b/src/gpu/effects/GrTextureDomain.h
@@ -169,8 +169,6 @@ public:
 
     const char* name() const override { return "TextureDomain"; }
 
-    GrGLFragmentProcessor* createGLInstance() const override;
-
     const GrTextureDomain& textureDomain() const { return fTextureDomain; }
 
 protected:
@@ -185,6 +183,8 @@ private:
                           GrTextureParams::FilterMode,
                           GrCoordSet);
 
+    GrGLFragmentProcessor* onCreateGLInstance() const override;
+
     void onGetGLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override;
 
     bool onIsEqual(const GrFragmentProcessor&) const override;