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

src/effects/SkColorCubeFilter.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkColorCubeFilter.h"
 #include "SkColorPriv.h"
 #include "SkOnce.h"
@@ skipping 222 matching lines @@
 
     GrCoordTransform    fColorCubeTransform;
     GrTextureAccess     fColorCubeAccess;
 
     typedef GrFragmentProcessor INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 GrColorCubeEffect::GrColorCubeEffect(GrTexture* colorCube)
-    : fColorCubeTransform(kLocal_GrCoordSet, colorCube)
+    : fColorCubeTransform(kLocal_GrCoordSet, colorCube, GrTextureParams::kBilerp_FilterMode)
     , fColorCubeAccess(colorCube, "bgra", GrTextureParams::kBilerp_FilterMode) {
     this->initClassID<GrColorCubeEffect>();
     this->addCoordTransform(&fColorCubeTransform);
     this->addTextureAccess(&fColorCubeAccess);
 }
 
 GrColorCubeEffect::~GrColorCubeEffect() {
 }
 
 void GrColorCubeEffect::getGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const {
@@ skipping 106 matching lines @@
     SkAutoTUnref<GrTexture> textureCube;
     if (surface) {
         textureCube.reset(surface->asTexture());
     } else {
         textureCube.reset(context->createTexture(NULL, desc, cacheID, fCubeData->data(), 0));
     }
 
     return textureCube ? GrColorCubeEffect::Create(textureCube) : NULL;
 }
 #endif