Add support for the new function-type syntax.

tests/language/generic_function_typedef_test.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file

[ahe, 2017/04/27 12:50:20]

Wrong year.

[floitsch, 2017/04/27 13:24:52]

done in https://codereview.chromium.org/2850473002/

+// 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.
+// Dart test for a function type test that cannot be eliminated at compile time.
+
+import "package:expect/expect.dart";
+
+class A {
+}
+
+typedef F<T> = Function<S>(List<S> list, Function<A>(A), T);
+
+foo(List<dynamic> x, bar(String y), int z) {}
+foo2(List<int> x, bar(String y), int z) {}
+
+main() {
+  Expect.isTrue(foo is F);
+  Expect.isTrue(foo is F<int>);
+  Expect.isFalse(foo is F<bool>);
+
+  Expect.isTrue(foo2 is F);
+  Expect.isTrue(foo2 is F<int>);
+  Expect.isFalse(foo2 is F<bool>);
+}