New cross frame base types

lib/html/src/CrossFrameTypes.dart

+// Copyright (c) 2012, 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.
+
+abstract class Window {
+  // Fields.
+  Location get location;
+  History get history;
+
+  bool get closed;
+  Window get opener;
+  Window get parent;
+  Window get top;
+
+  // TODO(vsm): Add frames to navigate subframes.  See 2312.
+
+  // Methods.
+  void focus();
+  void blur();
+  void close();
+  void postMessage(Dynamic message,
+                   String targetOrigin,
+                   [List messagePorts = null]);
+}
+
+abstract class Location {
+  void set href(String val);
+}
+
+abstract class History {
+  void back();
+  void forward();
+  void go(int distance);
+}