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/ScalarBench.cpp b/bench/ScalarBench.cpp
index 405d51e..333dd22 100644
--- a/bench/ScalarBench.cpp
+++ b/bench/ScalarBench.cpp
@@ -56,7 +56,7 @@
 // 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();
     }
@@ -102,7 +102,7 @@
 class IsFiniteScalarBench : public ScalarBench {
 public:
     IsFiniteScalarBench(void* param) : INHERITED(param, "isfinite") {
-        SkMWCRandom rand;
+        SkRandom rand;
         for (size_t i = 0; i < ARRAY_N; ++i) {
             fArray[i] = rand.nextSScalar1();
         }
@@ -141,7 +141,7 @@
 
 public:
     RectBoundsBench(void* param) : INHERITED(param) {
-        SkMWCRandom rand;
+        SkRandom rand;
         for (int i = 0; i < PTS; ++i) {
             fPts[i].fX = rand.nextSScalar1();
             fPts[i].fY = rand.nextSScalar1();