Fix dynamic calls on JS interop classes.

tests/lib_strong/html/js_typed_interop_dynamic_test.dart

Index: tests/lib_strong/html/js_typed_interop_dynamic_test.dart
diff --git a/tests/lib_strong/html/js_typed_interop_dynamic_test.dart b/tests/lib_strong/html/js_typed_interop_dynamic_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..9c77cd8ad5a65c67b0fba788aeeaa145e81937fb
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+++ b/tests/lib_strong/html/js_typed_interop_dynamic_test.dart
@@ -0,0 +1,55 @@
+// Copyright (c) 2015, 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.
+
+@JS()
+library js_typed_interop_anonymous_test;
+
+import 'dart:html';
+import 'dart:js' as js;
+
+import 'package:js/js.dart';
+import 'package:js/js_util.dart' as js_util;
+import 'package:expect/minitest.dart';
+
+@JS()
+@anonymous
+class Literal {
+  external factory Literal({int x, String y, num z, Function foo});
+
+  external int get x;
+  external String get y;
+  external num get z;
+  external Function get foo;
+}
+
+@JS()
+@anonymous
+class FunctionWithExpando {
+  external int call();
+  external String get myExpando;
+}
+
+main() {
+  test('object', () {
+    dynamic l = new Literal(x: 3, y: 'foo', foo: allowInterop((x) => x * 2));
+    expect(l.x, equals(3));
+    expect(l.y, equals('foo'));
+    expect(l.z, isNull);
+    expect(l.foo(4), equals(8));
+  });
+
+  test('function', () {
+    // Get a JS function.
+    dynamic f = js_util.getProperty(window, 'addEventListener');
+    js_util.setProperty(f, 'myExpando', 'foo');
+    expect(f.myExpando, equals('foo'));
+  });
+
+  test('dart object', () {
+    dynamic o = new Object();
+    js_util.setProperty(o, 'x', 3);
+    expect(() => o.x, throwsNoSuchMethodError);
+    expect(() => o.foo(), throwsNoSuchMethodError);
+  });
+}