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

src/gpu/effects/GrTextureDomainEffect.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 GrTextureDomainEffect_DEFINED
 #define GrTextureDomainEffect_DEFINED
 
@@ skipping 20 matching lines @@
      */
     enum WrapMode {
         kClamp_WrapMode,
         kDecal_WrapMode,
     };
 
     static GrEffectRef* Create(GrTexture*,
                                const SkMatrix&,
                                const SkRect& domain,
                                WrapMode,
-                               bool bilerp,
+                               GrTextureParams::FilterMode filterMode,
                                CoordsType = kLocal_CoordsType);
 
     virtual ~GrTextureDomainEffect();
 
     static const char* Name() { return "TextureDomain"; }
 
     typedef GrGLTextureDomainEffect GLEffect;
 
     virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
     virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
@@ skipping 17 matching lines @@
 
 protected:
     WrapMode fWrapMode;
     SkRect   fTextureDomain;
 
 private:
     GrTextureDomainEffect(GrTexture*,
                           const SkMatrix&,
                           const SkRect& domain,
                           WrapMode,
-                          bool bilerp,
+                          GrTextureParams::FilterMode filterMode,
                           CoordsType type);
 
     virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
 
     GR_DECLARE_EFFECT_TEST;
 
     typedef GrSingleTextureEffect INHERITED;
 };
 
 #endif