Switch out random number generator for tests, benches, samples.

This change makes tests, benches and samples use the new SkMWCRandom PRNG. GMs will be saved for another time, as they'll require rebaselining.

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

Author: jvanverth@google.com

Review URL: https://chromiumcodereview.appspot.com/23653018

git-svn-id: http://skia.googlecode.com/svn/trunk@11136 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/PaintTest.cpp b/tests/PaintTest.cpp
index 38f66ea..a7bbffa 100644
--- a/tests/PaintTest.cpp
+++ b/tests/PaintTest.cpp
@@ -71,7 +71,7 @@
         { uni_to_utf32, SkPaint::kUTF32_TextEncoding },
     };
 
-    SkRandom rand;
+    SkMWCRandom rand;
     SkPaint paint;
     paint.setTypeface(SkTypeface::RefDefault())->unref();
     SkTypeface* face = paint.getTypeface();