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

tests/RegionTest.cpp

Index: tests/RegionTest.cpp
diff --git a/tests/RegionTest.cpp b/tests/RegionTest.cpp
index 1c06d7ecde66978b21ede4168f58bd8a3212a526..5d3946ebfe6afc57c82cf58c7ae9fe6198c8ff1a 100644
--- a/tests/RegionTest.cpp
+++ b/tests/RegionTest.cpp
@@ -98,7 +98,7 @@ enum {
     H = 256
 };
 
-static SkIRect randRect(SkMWCRandom& rand) {
+static SkIRect randRect(SkRandom& rand) {
     int x = rand.nextU() % W;
     int y = rand.nextU() % H;
     int w = rand.nextU() % W;
@@ -106,7 +106,7 @@ static SkIRect randRect(SkMWCRandom& rand) {
     return SkIRect::MakeXYWH(x, y, w >> 1, h >> 1);
 }
 
-static void randRgn(SkMWCRandom& rand, SkRegion* rgn, int n) {
+static void randRgn(SkRandom& rand, SkRegion* rgn, int n) {
     rgn->setEmpty();
     for (int i = 0; i < n; ++i) {
         rgn->op(randRect(rand), SkRegion::kUnion_Op);
@@ -183,7 +183,7 @@ static void intersects_proc(skiatest::Reporter* reporter,
 static void test_proc(skiatest::Reporter* reporter,
                       void (*proc)(skiatest::Reporter*,
                                    const SkRegion& a, const SkRegion&)) {
-    SkMWCRandom rand;
+    SkRandom rand;
     for (int i = 0; i < 10000; ++i) {
         SkRegion outer;
         randRgn(rand, &outer, 8);
@@ -193,7 +193,7 @@ static void test_proc(skiatest::Reporter* reporter,
     }
 }
 
-static void rand_rect(SkIRect* rect, SkMWCRandom& rand) {
+static void rand_rect(SkIRect* rect, SkRandom& rand) {
     int bits = 6;
     int shift = 32 - bits;
     rect->set(rand.nextU() >> shift, rand.nextU() >> shift,
@@ -237,7 +237,7 @@ static void TestRegion(skiatest::Reporter* reporter) {
     };
     REPORTER_ASSERT(reporter, test_rects(rects, SK_ARRAY_COUNT(rects)));
 
-    SkMWCRandom rand;
+    SkRandom rand;
     for (int i = 0; i < 1000; i++) {
         SkRegion rgn0, rgn1;