Make GrGLShaderBuilder::TextureSampler extract only required info from GrTextureAccess.

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 36 matching lines @@
                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_ValidComponentFlag) && 0xFF == GrColorUnpackA(*color) &&
+        if ((*validFlags & kA_GrColorComponentFlag) && 0xFF == GrColorUnpackA(*color) &&
             GrPixelConfigIsOpaque(this->texture(0)->config())) {
-            *validFlags = kA_ValidComponentFlag;
+            *validFlags = kA_GrColorComponentFlag;
         } else {
             *validFlags = 0;
         }
     }
 
 private:
     GrTextureAccess fTextureAccess;
     SkMatrix        fMatrix;
     CoordsType      fCoordsType;
 
     typedef GrEffect INHERITED;
 };
 
 #endif