Implement accessing lazily initialized static fields.

dart/tests/lib/mirrors/lazy_static_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.
+
+// Test static members.
+
+import 'dart:mirrors';
+
+import 'package:expect/expect.dart';
+
+import 'stringify.dart';
+
+class Foo {
+  static var hello = {
+    'a': 'b',
+    'c': 'd',
+  };
+}
+
+void main() {
+  expect('Variable(s(hello) in s(Foo), static)',
+         reflectClass(Foo).members[new Symbol('hello')]);
+  var reflectee = reflectClass(Foo).getField(new Symbol('hello')).reflectee;
+  Expect.stringEquals('a, c', reflectee.keys.join(', '));
+  // Call the lazy getter twice as different things probably happen in the
+  // underlying implementation.
+  reflectee = reflectClass(Foo).getField(new Symbol('hello')).reflectee;
+  Expect.stringEquals('a, c', reflectee.keys.join(', '));
+  var value = 'fisk';
+  Foo.hello = value;
+  reflectee = reflectClass(Foo).getField(new Symbol('hello')).reflectee;
+  Expect.identical(value, reflectee);
+}