Use threshold of 1 texture coord value per pixel w/ nearest neighbor.

src/gpu/effects/GrSingleTextureEffect.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 "effects/GrSingleTextureEffect.h"
 
 GrSingleTextureEffect::GrSingleTextureEffect(GrTexture* texture,
                                              const SkMatrix& m,
                                              GrCoordSet coordSet)
-    : fCoordTransform(coordSet, m, texture)
+    : fCoordTransform(coordSet, m, texture, GrTextureParams::kNone_FilterMode)
     , fTextureAccess(texture) {
     this->addCoordTransform(&fCoordTransform);
     this->addTextureAccess(&fTextureAccess);
 }
 
 GrSingleTextureEffect::GrSingleTextureEffect(GrTexture* texture,
                                              const SkMatrix& m,
                                              GrTextureParams::FilterMode filterMode,
                                              GrCoordSet coordSet)
-    : fCoordTransform(coordSet, m, texture)
+    : fCoordTransform(coordSet, m, texture, filterMode)
     , fTextureAccess(texture, filterMode) {
     this->addCoordTransform(&fCoordTransform);
     this->addTextureAccess(&fTextureAccess);
 }
 
 GrSingleTextureEffect::GrSingleTextureEffect(GrTexture* texture,
                                              const SkMatrix& m,
                                              const GrTextureParams& params,
                                              GrCoordSet coordSet)
-    : fCoordTransform(coordSet, m, texture)
+    : fCoordTransform(coordSet, m, texture, params.filterMode())
     , fTextureAccess(texture, params) {
     this->addCoordTransform(&fCoordTransform);
     this->addTextureAccess(&fTextureAccess);
 }
 
 GrSingleTextureEffect::~GrSingleTextureEffect() {
 }