Introduce GrColorSpaceXform, for gamut conversion on textures

src/effects/GrCircleBlurFragmentProcessor.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrCircleBlurFragmentProcessor.h"
 
 #if SK_SUPPORT_GPU
@@ skipping 77 matching lines @@
 
 GrCircleBlurFragmentProcessor::GrCircleBlurFragmentProcessor(const SkRect& circle,
                                                              float sigma,
                                                              float solidRadius,
                                                              float textureRadius,
                                                              GrTexture* blurProfile)
     : fCircle(circle)
     , fSigma(sigma)
     , fSolidRadius(solidRadius)
     , fTextureRadius(textureRadius)
-    , fBlurProfileAccess(blurProfile, GrTextureParams::kBilerp_FilterMode) {
+    , fBlurProfileAccess(blurProfile, nullptr, GrTextureParams::kBilerp_FilterMode) {
     this->initClassID<GrCircleBlurFragmentProcessor>();
     this->addTextureAccess(&fBlurProfileAccess);
     this->setWillReadFragmentPosition();
 }
 
 GrGLSLFragmentProcessor* GrCircleBlurFragmentProcessor::onCreateGLSLInstance() const {
     return new GLSLProcessor;
 }
 
 void GrCircleBlurFragmentProcessor::onGetGLSLProcessorKey(const GrGLSLCaps& caps,
@@ skipping 206 matching lines @@
 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrCircleBlurFragmentProcessor);
 
 sk_sp<GrFragmentProcessor> GrCircleBlurFragmentProcessor::TestCreate(GrProcessorTestData* d) {
     SkScalar wh = d->fRandom->nextRangeScalar(100.f, 1000.f);
     SkScalar sigma = d->fRandom->nextRangeF(1.f,10.f);
     SkRect circle = SkRect::MakeWH(wh, wh);
     return GrCircleBlurFragmentProcessor::Make(d->fContext->textureProvider(), circle, sigma);
 }
 
 #endif