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

src/gpu/effects/GrYUVtoRGBEffect.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 "GrYUVtoRGBEffect.h"
 
 #include "GrCoordTransform.h"
@@ skipping 72 matching lines @@
         GLProcessor::GenKey(*this, caps, b);
     }
 
     virtual GrGLFragmentProcessor* createGLInstance() const SK_OVERRIDE {
         return SkNEW_ARGS(GLProcessor, (*this));
     }
 
 private:
     YUVtoRGBEffect(GrTexture* yTexture, GrTexture* uTexture, GrTexture* vTexture,
                    SkYUVColorSpace colorSpace)
-     : fCoordTransform(kLocal_GrCoordSet, GrCoordTransform::MakeDivByTextureWHMatrix(yTexture),
-                       yTexture)
+     : fCoordTransform(kLocal_GrCoordSet,
+                       GrCoordTransform::MakeDivByTextureWHMatrix(yTexture),
+                       yTexture, GrTextureParams::kNone_FilterMode)
     , fYAccess(yTexture)
     , fUAccess(uTexture)
     , fVAccess(vTexture)
     , fColorSpace(colorSpace) {
         this->initClassID<YUVtoRGBEffect>();
         this->addCoordTransform(&fCoordTransform);
         this->addTextureAccess(&fYAccess);
         this->addTextureAccess(&fUAccess);
         this->addTextureAccess(&fVAccess);
     }
@@ skipping 30 matching lines @@
     0.0f,    0.0f,    0.0f,    1.0};
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 GrFragmentProcessor*
 GrYUVtoRGBEffect::Create(GrTexture* yTexture, GrTexture* uTexture, GrTexture* vTexture,
                          SkYUVColorSpace colorSpace) {
     return YUVtoRGBEffect::Create(yTexture, uTexture, vTexture, colorSpace);
 }