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/samplecode/SampleFontCache.cpp b/samplecode/SampleFontCache.cpp
index c5f4457..050867e 100644
--- a/samplecode/SampleFontCache.cpp
+++ b/samplecode/SampleFontCache.cpp
@@ -16,7 +16,7 @@
 static void call_measure() {
     SkPaint paint;
     uint16_t text[32];
-    SkRandom rand;
+    SkMWCRandom rand;
 
     paint.setAntiAlias(true);
     paint.setTextEncoding(SkPaint::kUTF16_TextEncoding);
@@ -35,7 +35,7 @@
 static void call_draw(SkCanvas* canvas) {
     SkPaint paint;
     uint16_t text[32];
-    SkRandom rand;
+    SkMWCRandom rand;
 
     paint.setAntiAlias(true);
     paint.setTextEncoding(SkPaint::kUTF16_TextEncoding);