Change old PRG to be SkLCGRandom; change new one to SkRandom

src/effects/SkBitmapAlphaThresholdShader.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 "SkBitmapAlphaThresholdShader.h"
 
 class BATShader : public SkShader {
@@ skipping 217 matching lines @@
     GrTextureAccess fMaskAccess;
 
     SkMatrix fBmpMatrix;
     SkMatrix fMaskMatrix;
 
     SkScalar fThreshold;
 };
 
 GR_DEFINE_EFFECT_TEST(ThresholdEffect);
 
-GrEffectRef* ThresholdEffect::TestCreate(SkMWCRandom* rand,
+GrEffectRef* ThresholdEffect::TestCreate(SkRandom* rand,
                                          GrContext*,
                                          const GrDrawTargetCaps&,
                                          GrTexture* textures[]) {
     GrTexture* bmpTex = textures[GrEffectUnitTest::kSkiaPMTextureIdx];
     GrTexture* maskTex = textures[GrEffectUnitTest::kAlphaTextureIdx];
     U8CPU thresh = rand->nextU() % 0xff;
     return ThresholdEffect::Create(bmpTex, SkMatrix::I(), maskTex, SkMatrix::I(), thresh);
 }
 
 GrEffectRef* BATShader::asNewEffect(GrContext* context, const SkPaint& paint) const {
@@ skipping 53 matching lines @@
     GrEffectRef* effect = ThresholdEffect::Create(bmpTexture, bmpMatrix,
                                                   maskTexture, maskMatrix,
                                                   fThreshold);
 
     GrUnlockAndUnrefCachedBitmapTexture(bmpTexture);
 
     return effect;
 }
 
 #endif