Add a GrCustomCoordsTextureEffect class

src/gpu/effects/GrSingleTextureEffect.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrSingleTextureEffect_DEFINED
 #define GrSingleTextureEffect_DEFINED
 
@@ skipping 23 matching lines @@
                           CoordsType = kLocal_CoordsType);
     GrSingleTextureEffect(GrTexture*,
                           const SkMatrix&,
                           const GrTextureParams&,
                           CoordsType = kLocal_CoordsType);
 
     /**
      * Helper for subclass onIsEqual() functions.
      */
     bool hasSameTextureParamsMatrixAndCoordsType(const GrSingleTextureEffect& other) const {
-        const GrTextureAccess& otherAccess = other.fTextureAccess;
         // We don't have to check the accesses' swizzles because they are inferred from the texture.
-        return fTextureAccess.getTexture() == otherAccess.getTexture() &&
-               fTextureAccess.getParams() == otherAccess.getParams() &&
+        return fTextureAccess == other.fTextureAccess &&
                this->getMatrix().cheapEqualTo(other.getMatrix()) &&
                fCoordsType == other.fCoordsType;
     }
 
     /**
      * Can be used as a helper to implement subclass getConstantColorComponents(). It assumes that
      * the subclass output color will be a modulation of the input color with a value read from the
      * texture.
      */
     void updateConstantColorComponentsForModulation(GrColor* color, uint32_t* validFlags) const {
         if ((*validFlags & kA_GrColorComponentFlag) && 0xFF == GrColorUnpackA(*color) &&
             GrPixelConfigIsOpaque(this->texture(0)->config())) {
             *validFlags = kA_GrColorComponentFlag;
         } else {
             *validFlags = 0;
         }
     }
 
 private:
     GrTextureAccess fTextureAccess;
     SkMatrix        fMatrix;
     CoordsType      fCoordsType;
 
     typedef GrEffect INHERITED;
 };
 
 #endif