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

include/gpu/GrEffect.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 GrEffect_DEFINED
 #define GrEffect_DEFINED
 
@@ skipping 69 matching lines @@
     enum CoordsType {
         kLocal_CoordsType,
         kPosition_CoordsType,
 
         kCustom_CoordsType,
     };
 
     virtual ~GrEffect();
 
     /**
-     * Flags for getConstantColorComponents. They are defined so that the bit order reflects the
-     * GrColor shift order.
-     */
-    enum ValidComponentFlags {
-        kR_ValidComponentFlag = 1 << (GrColor_SHIFT_R / 8),
-        kG_ValidComponentFlag = 1 << (GrColor_SHIFT_G / 8),
-        kB_ValidComponentFlag = 1 << (GrColor_SHIFT_B / 8),
-        kA_ValidComponentFlag = 1 << (GrColor_SHIFT_A / 8),
-
-        kAll_ValidComponentFlags = (kR_ValidComponentFlag | kG_ValidComponentFlag |
-                                    kB_ValidComponentFlag | kA_ValidComponentFlag)
-    };
-
-    /**
      * This function is used to perform optimizations. When called the color and validFlags params
-     * indicate whether the input components to this effect in the FS will have known values. The
-     * function updates both params to indicate known values of its output. A component of the color
-     * param only has meaning if the corresponding bit in validFlags is set.
+     * indicate whether the input components to this effect in the FS will have known values.
+     * validFlags is a bitfield of GrColorComponentFlags. The function updates both params to
+     * indicate known values of its output. A component of the color param only has meaning if the
+     * corresponding bit in validFlags is set.
      */
     virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const = 0;
 
     /** This object, besides creating back-end-specific helper objects, is used for run-time-type-
         identification. The factory should be an instance of templated class,
         GrTBackendEffectFactory. It is templated on the subclass of GrEffect. The subclass must have
         a nested type (or typedef) named GLEffect which will be the subclass of GrGLEffect created
         by the factory.
 
         Example:
@@ skipping 165 matching lines @@
     typedef GrRefCnt INHERITED;
 };
 
 inline GrEffectRef::GrEffectRef(GrEffect* effect) {
     GrAssert(NULL != effect);
     effect->ref();
     fEffect = effect;
 }
 
 #endif