Add "growable" parameter to List.filled constructor.

tests/corelib/list_filled_type_argument_test.dart

Index: tests/corelib/list_filled_type_argument_test.dart
diff --git a/tests/corelib/list_filled_type_argument_test.dart b/tests/corelib/list_filled_type_argument_test.dart
index 6d361cc05601351f5f34641de2c0c962c67442a5..1c3aff49e8db2ebe7e8286ed9f5cfe4670fddbda 100644
--- a/tests/corelib/list_filled_type_argument_test.dart
+++ b/tests/corelib/list_filled_type_argument_test.dart
@@ -8,4 +8,8 @@ main() {
   var a = new List<int>.filled(42, 42);
   Expect.isTrue(a is List<int>);
   Expect.isFalse(a is List<String>);
+
+  a = new List<int>.filled(42, 42, growable: true);
+  Expect.isTrue(a is List<int>);
+  Expect.isFalse(a is List<String>);
 }