Add more tested features to closure_test

tests/compiler/dart2js/inference/inference_test_helper.dart

Index: tests/compiler/dart2js/inference/inference_test_helper.dart
diff --git a/tests/compiler/dart2js/inference/inference_test_helper.dart b/tests/compiler/dart2js/inference/inference_test_helper.dart
index aa543c717405d7b2a6dbc415bf0d4dcb230214f0..20e32e3152d8d9b9be617bd54cea2ddee2992fcd 100644
--- a/tests/compiler/dart2js/inference/inference_test_helper.dart
+++ b/tests/compiler/dart2js/inference/inference_test_helper.dart
@@ -17,7 +17,8 @@ import '../equivalence/id_equivalence_helper.dart';
 /// Fills [actualMap] with the data and [sourceSpanMap] with the source spans
 /// for the data origin.
 void computeMemberAstTypeMasks(Compiler compiler, MemberEntity _member,
-    Map<Id, String> actualMap, Map<Id, Spannable> spannableMap) {
+    Map<Id, String> actualMap, Map<Id, Spannable> spannableMap,
+    {bool verbose: false}) {
   MemberElement member = _member;
   ResolvedAst resolvedAst = member.resolvedAst;
   if (resolvedAst.kind != ResolvedAstKind.PARSED) return;