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/bench/MatrixBench.cpp b/bench/MatrixBench.cpp
index e7054d4..8a5c5c6 100644
--- a/bench/MatrixBench.cpp
+++ b/bench/MatrixBench.cpp
@@ -95,7 +95,7 @@
 // handling NaN values is a lot slower. Anyway, this guy is just meant to put
 // reasonable values in our arrays.
 template <typename T> void init9(T array[9]) {
-    SkMWCRandom rand;
+    SkRandom rand;
     for (int i = 0; i < 9; i++) {
         array[i] = rand.nextSScalar1();
     }
@@ -261,7 +261,7 @@
 private:
     SkMatrix fMatrix;
     float fArray[9];
-    SkMWCRandom fRnd;
+    SkRandom fRnd;
     typedef MatrixBench INHERITED;
 };
 
@@ -302,7 +302,7 @@
     SkMatrix fMatrix;
     SkPoint fSrc [16];
     SkPoint fDst [16];
-    SkMWCRandom fRandom;
+    SkRandom fRandom;
     typedef MatrixBench INHERITED;
 };
 
@@ -342,7 +342,7 @@
     double fMatrix [9];
     SkPoint fSrc [16];
     SkPoint fDst [16];
-    SkMWCRandom fRandom;
+    SkRandom fRandom;
     typedef MatrixBench INHERITED;
 };
 
@@ -370,7 +370,7 @@
     }
 private:
     SkMatrix fMatrix[10];
-    SkMWCRandom fRandom;
+    SkRandom fRandom;
     typedef MatrixBench INHERITED;
 };