Change random number generator for tests to SkMWCRandom

tests/AAClipTest.cpp

Index: tests/AAClipTest.cpp
===================================================================
--- tests/AAClipTest.cpp	(revision 7902)
+++ tests/AAClipTest.cpp	(working copy)
@@ -87,7 +87,7 @@
     canvas.drawColor(SK_ColorBLACK);
 }
 
-static SkIRect rand_rect(SkRandom& rand, int n) {
+static SkIRect rand_rect(SkMWCRandom& rand, int n) {
     int x = rand.nextS() % n;
     int y = rand.nextS() % n;
     int w = rand.nextU() % n;
@@ -95,7 +95,7 @@
     return SkIRect::MakeXYWH(x, y, w, h);
 }
 
-static void make_rand_rgn(SkRegion* rgn, SkRandom& rand) {
+static void make_rand_rgn(SkRegion* rgn, SkMWCRandom& rand) {
     int count = rand.nextU() % 20;
     for (int i = 0; i < count; ++i) {
         rgn->op(rand_rect(rand, 100), SkRegion::kXOR_Op);
@@ -128,7 +128,7 @@
 
 // aaclip.setRegion should create idential masks to the region
 static void test_rgn(skiatest::Reporter* reporter) {
-    SkRandom rand;
+    SkMWCRandom rand;
     for (int i = 0; i < 1000; i++) {
         SkRegion rgn;
         make_rand_rgn(&rgn, rand);
@@ -232,7 +232,7 @@
     REPORTER_ASSERT(reporter, mask.fBounds.isEmpty());
 }
 
-static void rand_irect(SkIRect* r, int N, SkRandom& rand) {
+static void rand_irect(SkIRect* r, int N, SkMWCRandom& rand) {
     r->setXYWH(0, 0, rand.nextU() % N, rand.nextU() % N);
     int dx = rand.nextU() % (2*N);
     int dy = rand.nextU() % (2*N);
@@ -241,7 +241,7 @@
 }
 
 static void test_irect(skiatest::Reporter* reporter) {
-    SkRandom rand;
+    SkMWCRandom rand;
 
     for (int i = 0; i < 10000; i++) {
         SkAAClip clip0, clip1;