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/gm/points.cpp b/gm/points.cpp
index 0a83acf..4902c88 100644
--- a/gm/points.cpp
+++ b/gm/points.cpp
@@ -23,7 +23,7 @@
         return make_isize(640, 490);
     }
 
-    static void fill_pts(SkPoint pts[], size_t n, SkRandom* rand) {
+    static void fill_pts(SkPoint pts[], size_t n, SkLCGRandom* rand) {
         for (size_t i = 0; i < n; i++) {
             // Compute these independently and store in variables, rather
             // than in the parameter-passing expression, to get consistent
@@ -37,7 +37,7 @@
     virtual void onDraw(SkCanvas* canvas) {
         canvas->translate(SK_Scalar1, SK_Scalar1);
 
-        SkRandom rand;
+        SkLCGRandom rand;
         SkPaint  p0, p1, p2, p3;
         const size_t n = 99;