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

src/effects/SkBlendImageFilter.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBlendImageFilter.h"
 #include "SkCanvas.h"
 #include "SkColorPriv.h"
@@ skipping 197 matching lines @@
 const GrBackendEffectFactory& GrBlendEffect::getFactory() const {
     return GrTBackendEffectFactory<GrBlendEffect>::getInstance();
 }
 
 void GrBlendEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
     // The output alpha is always 1 - (1 - FGa) * (1 - BGa). So if either FGa or BGa is known to
     // be one then the output alpha is one. (This effect ignores its input. We should have a way to
     // communicate this.)
     if (GrPixelConfigIsOpaque(fForegroundAccess.getTexture()->config()) ||
         GrPixelConfigIsOpaque(fBackgroundAccess.getTexture()->config())) {
-        *validFlags = kA_ValidComponentFlag;
+        *validFlags = kA_GrColorComponentFlag;
         *color = GrColorPackRGBA(0, 0, 0, 0xff);
     } else {
         *validFlags = 0;
     }
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 GrGLBlendEffect::GrGLBlendEffect(const GrBackendEffectFactory& factory,
                                  const GrDrawEffect& drawEffect)
@@ skipping 83 matching lines @@
     EffectKey bgKey = GrGLEffectMatrix::GenKey(GrEffect::MakeDivByTextureWHMatrix(bgTex),
                                                drawEffect,
                                                kCoordsType,
                                                bgTex);
     bgKey <<= GrGLEffectMatrix::kKeyBits;
     EffectKey modeKey = blend.mode() << (2 * GrGLEffectMatrix::kKeyBits);
 
     return  modeKey | bgKey | fgKey;
 }
 #endif