Make all GrFragmentProcessors GL independent.

src/effects/GrCircleBlurFragmentProcessor.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 GrCircleBlurFragmentProcessor_DEFINED
 #define GrCircleBlurFragmentProcessor_DEFINED
 
@@ skipping 30 matching lines @@
 
     const SkRect& circle() const { return fCircle; }
     float sigma() const { return fSigma; }
     float offset() const { return fOffset; }
     int profileSize() const { return fBlurProfileAccess.getTexture()->width(); }
 
 private:
     GrCircleBlurFragmentProcessor(const SkRect& circle, float sigma,
                                   float offset, GrTexture* blurProfile);
 
-    GrGLFragmentProcessor* onCreateGLInstance() const override;
+    GrGLSLFragmentProcessor* onCreateGLInstance() const override;
 
     void onGetGLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override;
 
     bool onIsEqual(const GrFragmentProcessor& other) const override {
         const GrCircleBlurFragmentProcessor& cbfp = other.cast<GrCircleBlurFragmentProcessor>();
         // fOffset is computed from the circle width and the sigma
         return this->circle().width() == cbfp.circle().width() && fSigma == cbfp.fSigma;    
     }
 
     void onComputeInvariantOutput(GrInvariantOutput* inout) const override;
 
     static GrTexture* CreateCircleBlurProfileTexture(GrTextureProvider*,
                                                      const SkRect& circle,
                                                      float sigma, float* offset);
 
     SkRect              fCircle;
     float               fSigma;
     float               fOffset;
     GrTextureAccess     fBlurProfileAccess;
 
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
 
     typedef GrFragmentProcessor INHERITED;
 };
 
 #endif
 #endif