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

src/effects/SkGpuBlurUtils.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGpuBlurUtils.h"
 
 #include "SkRect.h"
@@ skipping 189 matching lines @@
         SkMatrix matrix;
         matrix.setIDiv(srcTexture->width(), srcTexture->height());
         context->setRenderTarget(dstTexture->asRenderTarget());
         SkRect dstRect(srcRect);
         if (cropToRect && i == 1) {
             dstRect.offset(-dstRect.fLeft, -dstRect.fTop);
             SkRect domain;
             matrix.mapRect(&domain, rect);
             domain.inset(i < scaleFactorX ? SK_ScalarHalf / srcTexture->width() : 0.0f,
                          i < scaleFactorY ? SK_ScalarHalf / srcTexture->height() : 0.0f);
-            SkAutoTUnref<GrFragmentProcessor> fp(GrTextureDomainEffect::Create(
+            SkAutoTUnref<GrFragmentProcessor> fp(   GrTextureDomainEffect::Create(
                 srcTexture,
                 matrix,
                 domain,
                 GrTextureDomain::kDecal_Mode,
                 GrTextureParams::kBilerp_FilterMode));
             paint.addColorProcessor(fp);
         } else {
             GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kBilerp_FilterMode);
             paint.addColorTextureProcessor(srcTexture, matrix, params);
         }
@@ skipping 81 matching lines @@
         context->drawRectToRect(paint, dstRect, srcRect);
         srcRect = dstRect;
         srcTexture = dstTexture;
         SkTSwap(dstTexture, tempTexture);
     }
     return SkRef(srcTexture);
 }
 #endif
 
 }