Implement JsMethodMirror.parameters.

dart/tests/lib/mirrors/constructors_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test.constructors_test;
 
 import 'dart:mirrors';
 
 import 'package:expect/expect.dart';
 
-import 'reflect_model_test.dart';
+import 'stringify.dart';
 
 class Foo {
 }
 
 class Bar {
   Bar();
 }
 
 class Baz {
   Baz.named();
@@ skipping 16 matching lines @@
   Map<Symbol, MethodMirror> bizConstructors = bizMirror.constructors;
 
   expect('{Foo: Method(s(Foo) in s(Foo), constructor)}', fooConstructors);
   expect('{Bar: Method(s(Bar) in s(Bar), constructor)}', barConstructors);
   expect('{Baz.named: Method(s(Baz.named) in s(Baz), constructor)}',
          bazConstructors);
   expect('{Biz: Method(s(Biz) in s(Biz), constructor),'
          ' Biz.named: Method(s(Biz.named) in s(Biz), constructor)}',
          bizConstructors);
   print(bizConstructors);
+
+  expect('[]', fooConstructors.values.single.parameters);
+  expect('[]', barConstructors.values.single.parameters);
+  expect('[]', bazConstructors.values.single.parameters);
+  for (var constructor in bizConstructors.values) {
+    expect('[]', constructor.parameters);
+  }
 }