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

samplecode/SampleHairCurves.cpp

Index: samplecode/SampleHairCurves.cpp
diff --git a/samplecode/SampleHairCurves.cpp b/samplecode/SampleHairCurves.cpp
index 2cf0b3c90083a8981e2e36b5efffd414a28a66b4..421c950183309519fca80a1c99b0b5c89850bd41 100644
--- a/samplecode/SampleHairCurves.cpp
+++ b/samplecode/SampleHairCurves.cpp
@@ -34,8 +34,8 @@ protected:
         paint.setStrokeWidth(0);
         canvas->save();
         canvas->scale(1000 * SK_Scalar1, 1000 * SK_Scalar1);
-        SkRandom rand;
-        SkRandom randW;
+        SkMWCRandom rand;
+        SkMWCRandom randW;
         SkPath curves;
         SkPath hulls;
         SkPath ctrlPts;