Dart2js deferred loading. Follow types of functions when calculating dependencies.

tests/language/deferred_regression_22995_test.dart

+// 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.
+
+// Test that closurizing a function implies a dependency on its type.
+
+import "package:expect/expect.dart";
+
+import 'deferred_regression_22995_lib.dart' deferred as lib;
+
+class A {}
+class B {}
+class C {}
+
+typedef Ti(int x);
+typedef TB(B x);
+typedef TTi(Ti x);
+typedef Tg<T>(T x);
+
+class T {
+   fA(A a) => null;
+   fTB(TB a) => null;
+   fTgC(Tg<C> a) => null;
+}
+
+main() {
+  Expect.isFalse(new T().fA is Ti);
+  Expect.isFalse(new T().fTB is TTi);
+  Expect.isFalse(new T().fTgC is TTi);
+  lib.loadLibrary().then((_) {
+    lib.foofoo();
+  });
+}
+