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

src/gpu/GrSWMaskHelper.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrSWMaskHelper.h"
 #include "GrDrawState.h"
 #include "GrGpu.h"
@@ skipping 179 matching lines @@
     // maps to 0,0, and then a scaling matrix to normalized coords. We apply this matrix to the
     // vertex positions rather than local coords.
     SkMatrix maskMatrix;
     maskMatrix.setIDiv(texture->width(), texture->height());
     maskMatrix.preTranslate(SkIntToScalar(-rect.fLeft), SkIntToScalar(-rect.fTop));
     maskMatrix.preConcat(drawState->getViewMatrix());
 
     drawState->addCoverageEffect(
                          GrSimpleTextureEffect::Create(texture,
                                                        maskMatrix,
-                                                       false,
+                                                       GrTextureParams::kNone_FilterMode,
                                                        GrEffect::kPosition_CoordsType))->unref();
 
     target->drawSimpleRect(dstRect);
 }