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/RandomTest.cpp b/tests/RandomTest.cpp
index 51408e9..c9fee4a 100644
--- a/tests/RandomTest.cpp
+++ b/tests/RandomTest.cpp
@@ -61,7 +61,7 @@
     int bins[256];
     memset(bins, 0, sizeof(int)*256);
 
-    SkMWCRandom rand;
+    SkRandom rand;
     for (int i = 0; i < 256*10000; ++i) {
         bins[(rand.nextU() >> shift) & 0xff]++;
     }
@@ -73,7 +73,7 @@
     int bins[256];
     memset(bins, 0, sizeof(int)*256);
 
-    SkMWCRandom rand;
+    SkRandom rand;
     for (int i = 0; i < 256*10000; ++i) {
         float f = rand.nextF();
         REPORTER_ASSERT(reporter, 0.0f <= f && f < 1.0f);
@@ -108,7 +108,7 @@
     const int kNumEntries = kN >> 5;  // dividing by 32
     unsigned int entries[kNumEntries];
 
-    SkMWCRandom rand;
+    SkRandom rand;
     memset(entries, 0, sizeof(unsigned int)*kNumEntries);
     // pre-seed our string value
     int value = 0;
@@ -161,7 +161,7 @@
 }
 
 static void test_range(skiatest::Reporter* reporter) {
-    SkMWCRandom rand;
+    SkRandom rand;
 
     // just to make sure we don't crash in this case
     (void) rand.nextRangeU(0, 0xffffffff);