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

src/effects/SkPerlinNoiseShader.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 "SkDither.h"
 #include "SkPerlinNoiseShader.h"
 #include "SkFlattenableBuffers.h"
@@ skipping 694 matching lines @@
     }
 
     SkScalar fSeed;
 
     typedef GrNoiseEffect INHERITED;
 };
 
 /////////////////////////////////////////////////////////////////////
 GR_DEFINE_EFFECT_TEST(GrPerlinNoiseEffect);
 
-GrEffectRef* GrPerlinNoiseEffect::TestCreate(SkMWCRandom* random,
+GrEffectRef* GrPerlinNoiseEffect::TestCreate(SkRandom* random,
                                              GrContext* context,
                                              const GrDrawTargetCaps&,
                                              GrTexture**) {
     int      numOctaves = random->nextRangeU(2, 10);
     bool     stitchTiles = random->nextBool();
     SkScalar seed = SkIntToScalar(random->nextU());
     SkISize  tileSize = SkISize::Make(random->nextRangeU(4, 4096), random->nextRangeU(4, 4096));
     SkScalar baseFrequencyX = random->nextRangeScalar(SkFloatToScalar(0.01f),
                                                       SkFloatToScalar(0.99f));
     SkScalar baseFrequencyY = random->nextRangeScalar(SkFloatToScalar(0.01f),
@@ skipping 643 matching lines @@
     str->append(" seed: ");
     str->appendScalar(fSeed);
     str->append(" stitch tiles: ");
     str->append(fStitchTiles ? "true " : "false ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif