Create a static instances of SrcOver XferProcessor

src/gpu/effects/GrDisableColorXP.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "effects/GrDisableColorXP.h"
 #include "GrProcessor.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
@@ skipping 15 matching lines @@
 
     GrGLSLXferProcessor* createGLSLInstance() const override;
 
 private:
     DisableColorXP();
 
     GrXferProcessor::OptFlags onGetOptimizations(const GrProcOptInfo& colorPOI,
                                                  const GrProcOptInfo& coveragePOI,
                                                  bool doesStencilWrite,
                                                  GrColor* color,
-                                                 const GrCaps& caps) override {
+                                                 const GrCaps& caps) const override {
         return GrXferProcessor::kIgnoreColor_OptFlag | GrXferProcessor::kIgnoreCoverage_OptFlag;
     }
 
     void onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override;
 
     void onGetBlendInfo(GrXferProcessor::BlendInfo* blendInfo) const override;
 
     bool onIsEqual(const GrXferProcessor& xpBase) const override {
         return true;
     }
@@ skipping 55 matching lines @@
                                                const DstTexture* dst) const {
     return DisableColorXP::Create();
 }
 
 GR_DEFINE_XP_FACTORY_TEST(GrDisableColorXPFactory);
 
 const GrXPFactory* GrDisableColorXPFactory::TestCreate(GrProcessorTestData*) {
     return GrDisableColorXPFactory::Create();
 }