make the filter mode for GrTextureAccess an enum so we can plumb down

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 12 matching lines @@
 
     const SkMatrix& getMatrix() const { return fMatrix; }
 
     /** Indicates whether the matrix operates on local coords or positions */
     CoordsType coordsType() const { return fCoordsType; }
 
 protected:
     /** unfiltered, clamp mode */
     GrSingleTextureEffect(GrTexture*, const SkMatrix&, CoordsType = kLocal_CoordsType);
     /** clamp mode */
-    GrSingleTextureEffect(GrTexture*, const SkMatrix&, bool bilerp, CoordsType = kLocal_CoordsType);
+    GrSingleTextureEffect(GrTexture*, const SkMatrix&, GrTextureParams::FilterMode filterMode, 
+                          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;
@@ skipping 20 matching lines @@
 
 private:
     GrTextureAccess fTextureAccess;
     SkMatrix        fMatrix;
     CoordsType      fCoordsType;
 
     typedef GrEffect INHERITED;
 };
 
 #endif