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

tests/PackBitsTest.cpp

 
 /*
  * Copyright 2011 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 "SkPackBits.h"
 
 static const uint16_t gTest0[] = { 0, 0, 1, 1 };
 static const uint16_t gTest1[] = { 1, 2, 3, 4, 5, 6 };
 static const uint16_t gTest2[] = { 0, 0, 0, 1, 2, 3, 3, 3 };
 static const uint16_t gTest3[] = { 0, 0, 0, 0, 0, 0, 1, 2, 3, 3, 3, 0, 0, 1 };
 
 #include "SkRandom.h"
-static SkMWCRandom gRand;
+static SkRandom gRand;
 static void rand_fill(uint16_t buffer[], int count) {
     for (int i = 0; i < count; i++)
         buffer[i] = (uint16_t)gRand.nextU();
 }
 
 static void test_pack16(skiatest::Reporter* reporter) {
     static const struct {
         const uint16_t* fSrc;
         int             fCount;
     } gTests[] = {
@@ skipping 97 matching lines @@
     }
 }
 
 static void TestPackBits(skiatest::Reporter* reporter) {
     test_pack8(reporter);
     test_pack16(reporter);
 }
 
 #include "TestClassDef.h"
 DEFINE_TESTCLASS("PackBits", PackBitsTestClass, TestPackBits)