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

The goal here is to get people to start using the new random number
generator, while leaving the old one in place so we don't have to 
rebaseline GMs.

R=reed@google.com, bsalomon@google.com

Author: jvanverth@google.com

Review URL: https://chromiumcodereview.appspot.com/23576015

git-svn-id: http://skia.googlecode.com/svn/trunk@11169 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/MatrixTest.cpp b/tests/MatrixTest.cpp
index 0f4973f..d75de75 100644
--- a/tests/MatrixTest.cpp
+++ b/tests/MatrixTest.cpp
@@ -169,7 +169,7 @@
         bool invertable = mats[i].invert(&mats[i + SK_ARRAY_COUNT(baseMats)]);
         REPORTER_ASSERT(reporter, invertable);
     }
-    SkMWCRandom rand;
+    SkRandom rand;
     for (int m = 0; m < 1000; ++m) {
         SkMatrix mat;
         mat.reset();
@@ -492,7 +492,7 @@
     REPORTER_ASSERT(reporter, check_matrix_recomposition(mat, rotation1, scale, rotation2));
 
     // try some random matrices
-    SkMWCRandom rand;
+    SkRandom rand;
     for (int m = 0; m < 1000; ++m) {
         SkScalar rot0 = rand.nextRangeF(-180, 180);
         SkScalar sx = rand.nextRangeF(-3000.f, 3000.f);
@@ -574,7 +574,7 @@
 
     const int kTripleCount = 1000;
     const int kMatrixCount = 1000;
-    SkMWCRandom rand;
+    SkRandom rand;
 
     SkScalar randTriples[3*kTripleCount];
     for (int i = 0; i < 3*kTripleCount; ++i) {