Change old PRG to be SkLCGRandom; change new one to SkRandom

bench/RegionContainBench.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBenchmark.h"
 #include "SkRandom.h"
 #include "SkRegion.h"
@@ skipping 11 matching lines @@
     Proc     fProc;
     SkString fName;
 
     enum {
         W = 200,
         H = 200,
         COUNT = 10,
         N = SkBENCHLOOP(20000)
     };
 
-    SkIRect randrect(SkMWCRandom& rand, int i) {
+    SkIRect randrect(SkRandom& rand, int i) {
         int w = rand.nextU() % W;
         return SkIRect::MakeXYWH(0, i*H/COUNT, w, H/COUNT);
     }
 
     RegionContainBench(void* param, Proc proc, const char name[]) : INHERITED(param) {
         fProc = proc;
         fName.printf("region_contains_%s", name);
 
-        SkMWCRandom rand;
+        SkRandom rand;
         for (int i = 0; i < COUNT; i++) {
             fA.op(randrect(rand, i), SkRegion::kXOR_Op);
         }
 
         fB.setRect(0, 0, H, W);
 
         fIsRendering = false;
     }
 
 protected:
     virtual const char* onGetName() { return fName.c_str(); }
 
     virtual void onDraw(SkCanvas*) {
         Proc proc = fProc;
 
         for (int i = 0; i < N; ++i) {
            proc(fA, fB);
         }
     }
 
 private:
     typedef SkBenchmark INHERITED;
 };
 
 static SkBenchmark* gF0(void* p) { return SkNEW_ARGS(RegionContainBench, (p, sect_proc, "sect")); }
 
 static BenchRegistry gR0(gF0);