Make helper function on GrGLSLProgramDataManager non virtual

src/gpu/glsl/GrGLSLProgramDataManager.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 GrGLSLProgramDataManager_DEFINED
 #define GrGLSLProgramDataManager_DEFINED
 
@@ skipping 44 matching lines @@
     virtual void set4f(UniformHandle, float, float, float, float) const = 0;
     virtual void set4fv(UniformHandle, int arrayCount, const float v[]) const = 0;
     // matrices are column-major, the first three upload a single matrix, the latter three upload
     // arrayCount matrices into a uniform array.
     virtual void setMatrix3f(UniformHandle, const float matrix[]) const = 0;
     virtual void setMatrix4f(UniformHandle, const float matrix[]) const = 0;
     virtual void setMatrix3fv(UniformHandle, int arrayCount, const float matrices[]) const = 0;
     virtual void setMatrix4fv(UniformHandle, int arrayCount, const float matrices[]) const = 0;
 
     // convenience method for uploading a SkMatrix to a 3x3 matrix uniform
-    virtual void setSkMatrix(UniformHandle, const SkMatrix&) const = 0;
+    void setSkMatrix(UniformHandle, const SkMatrix&) const;
 
     // for nvpr only
     typedef ShaderResourceHandle VaryingHandle;
     virtual void setPathFragmentInputTransform(VaryingHandle u, int components,
                                                const SkMatrix& matrix) const = 0;
 
 protected:
     GrGLSLProgramDataManager() {}
 
 private:
 
     typedef SkNoncopyable INHERITED;
 };
 
 #endif