Revert of Change SkShader;asFragmentProcessor signature to no longer take skpaint\grcolor*

src/gpu/effects/GrPorterDuffXferProcessor.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/GrPorterDuffXferProcessor.h"
 
 #include "GrBlend.h"
@@ skipping 737 matching lines @@
     if (covPOI.isFourChannelOutput()) {
         return false; // The LCD XP will abort rather than doing a dst read.
     }
     // We fallback on the shader XP when the blend formula would use dual source blending but we
     // don't have support for it.
     return get_blend_formula(colorPOI, covPOI, hasMixedSamples, fXfermode).hasSecondaryOutput();
 }
 
 GR_DEFINE_XP_FACTORY_TEST(GrPorterDuffXPFactory);
 
-const GrXPFactory* GrPorterDuffXPFactory::TestCreate(GrProcessorTestData* d) {
+GrXPFactory* GrPorterDuffXPFactory::TestCreate(GrProcessorTestData* d) {
     SkXfermode::Mode mode = SkXfermode::Mode(d->fRandom->nextULessThan(SkXfermode::kLastCoeffMode));
     return GrPorterDuffXPFactory::Create(mode);
 }
 
 void GrPorterDuffXPFactory::TestGetXPOutputTypes(const GrXferProcessor* xp,
                                                  int* outPrimary,
                                                  int* outSecondary) {
     if (!!strcmp(xp->name(), "Porter Duff")) {
         *outPrimary = *outSecondary = -1;
         return;
     }
     BlendFormula blendFormula = static_cast<const PorterDuffXferProcessor*>(xp)->getBlendFormula();
     *outPrimary = blendFormula.fPrimaryOutputType;
     *outSecondary = blendFormula.fSecondaryOutputType;
 }