Introduce a RandonNumberGenerator class. Refactor the random/private_random uses in Isolate/Context.

test/cctest/test-random.cc

Index: test/cctest/test-random.cc
diff --git a/test/cctest/test-random.cc b/test/cctest/test-random.cc
index 804546a03e315057ce26376f38d851dc69030ea7..4227326a92cb275275ce076f558fa2af9f1068c6 100644
--- a/test/cctest/test-random.cc
+++ b/test/cctest/test-random.cc
@@ -96,14 +96,5 @@ TEST(CrankshaftRandom) {
   // Test with some random values.
   TestSeeds(fun, context, 0xC0C0AFFE, 0x31415926);
   TestSeeds(fun, context, 0x01020304, 0xFFFFFFFF);
-  TestSeeds(fun, context, 0x00000001, 0x00000000);
-
-  // Test that we bail out to runtime when seeds are uninitialized (zeros).
-  SetSeeds(seeds, 0, 0);
-  Handle<Object> value =
-      Execution::Call(isolate, fun, global, 0, NULL, &has_pending_exception);
-  CHECK(value->IsHeapNumber());
-  CHECK(fun->IsOptimized());
-  double crankshaft_value = HeapNumber::cast(*value)->value();
-  CHECK_NE(0.0, crankshaft_value);
+  TestSeeds(fun, context, 0x00000001, 0x00000001);
 }