Make ClassMirror.typeVariables lazy and convert dependencies to native code.

tests/lib/mirrors/class_mirror_type_variables_test.dart

Index: tests/lib/mirrors/class_mirror_type_variables_test.dart
diff --git a/tests/lib/mirrors/class_mirror_type_variables_test.dart b/tests/lib/mirrors/class_mirror_type_variables_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..2b02bad6104afc8ff336da95433930c3fd63ff55
--- /dev/null
+++ b/tests/lib/mirrors/class_mirror_type_variables_test.dart
@@ -0,0 +1,33 @@
+// 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.
+
+import "dart:mirrors";
+
+import "package:expect/expect.dart";
+
+class C<R,S,T> {
+  R foo(R r) => r; 
+  S bar(S s) => s; 
+  T baz(T t) => t; 
+}
+
+class NoTypeParams {}
+
+main() {
+  ClassMirror cm;
+  cm = reflectClass(C);
+  Expect.equals(3, cm.typeVariables.length);
+  Expect.equals(true, cm.typeVariables.containsKey(const Symbol("R")));
+  Expect.equals(true, cm.typeVariables.containsKey(const Symbol("S")));
+  Expect.equals(true, cm.typeVariables.containsKey(const Symbol("T")));
+  var values = cm.typeVariables.values;
+  values.forEach((e) {
+    Expect.equals(true, e is TypeVariableMirror);
+  });
+  Expect.equals(const Symbol("R"), values.elementAt(0).simpleName);
+  Expect.equals(const Symbol("S"), values.elementAt(1).simpleName);
+  Expect.equals(const Symbol("T"), values.elementAt(2).simpleName);
+  cm = reflectClass(NoTypeParams);
+  Expect.equals(cm.typeVariables.length, 0);
+}