Introduce GrColorSpaceXform, for gamut conversion on textures

src/gpu/effects/GrBitmapTextGeoProc.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBitmapTextGeoProc.h"
 #include "GrInvariantOutput.h"
 #include "GrTexture.h"
@@ skipping 116 matching lines @@
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 GrBitmapTextGeoProc::GrBitmapTextGeoProc(GrColor color, GrTexture* texture,
                                          const GrTextureParams& params, GrMaskFormat format,
                                          const SkMatrix& localMatrix, bool usesLocalCoords)
     : fColor(color)
     , fLocalMatrix(localMatrix)
     , fUsesLocalCoords(usesLocalCoords)
-    , fTextureAccess(texture, params)
+    , fTextureAccess(texture, nullptr, params)
     , fInColor(nullptr)
     , fMaskFormat(format) {
     this->initClassID<GrBitmapTextGeoProc>();
     fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType));
 
     bool hasVertexColor = kA8_GrMaskFormat == fMaskFormat ||
                           kA565_GrMaskFormat == fMaskFormat;
     if (hasVertexColor) {
         fInColor = &this->addVertexAttrib(Attribute("inColor", kVec4ub_GrVertexAttribType));
     }
@@ skipping 41 matching lines @@
             break;
         case 2:
             format = kARGB_GrMaskFormat;
             break;
     }
 
     return GrBitmapTextGeoProc::Make(GrRandomColor(d->fRandom), d->fTextures[texIdx], params,
                                      format, GrTest::TestMatrix(d->fRandom),
                                      d->fRandom->nextBool());
 }