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

tests/MipMapTest.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 "Test.h"
 #include "SkMipMap.h"
 #include "SkBitmap.h"
 #include "SkRandom.h"
 
-static void make_bitmap(SkBitmap* bm, SkMWCRandom& rand) {
+static void make_bitmap(SkBitmap* bm, SkRandom& rand) {
     // for now, Build needs a min size of 2, otherwise it will return NULL.
     // should fix that to support 1 X N, where N > 1 to return non-null.
     int w = 2 + rand.nextU() % 1000;
     int h = 2 + rand.nextU() % 1000;
     bm->setConfig(SkBitmap::kARGB_8888_Config, w, h);
     bm->allocPixels();
     bm->eraseColor(SK_ColorWHITE);
 }
 
 static void TestMipMap(skiatest::Reporter* reporter) {
     SkBitmap bm;
-    SkMWCRandom rand;
+    SkRandom rand;
 
     for (int i = 0; i < 500; ++i) {
         make_bitmap(&bm, rand);
         SkAutoTUnref<SkMipMap> mm(SkMipMap::Build(bm));
 
         REPORTER_ASSERT(reporter, !mm->extractLevel(SK_Scalar1, NULL));
         REPORTER_ASSERT(reporter, !mm->extractLevel(SK_Scalar1 * 2, NULL));
 
         SkMipMap::Level prevLevel;
         sk_bzero(&prevLevel, sizeof(prevLevel));
@@ skipping 14 matching lines @@
                     REPORTER_ASSERT(reporter, level.fHeight <= prevLevel.fHeight);
                 }
                 prevLevel = level;
             }
         }
     }
 }
 
 #include "TestClassDef.h"
 DEFINE_TESTCLASS("MipMap", MipMapTestClass, TestMipMap)