Make Storage implement Map.

lib/dom/scripts/systemhtml.py

 #!/usr/bin/python
 # 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.
 
 """This module provides shared functionality for the system to generate
 Dart:html APIs from the IDL database."""
 
 from systemfrog import *
 from systeminterface import *
@@ skipping 46 matching lines @@
   'MouseEvent.initMouseEvent',
   'Node.appendChild',
   'Node.attributes',
   'Node.childNodes',
   'Node.firstChild',
   'Node.lastChild',
   "Node.nodeType",
   'Node.removeChild',
   'Node.replaceChild',
   'NodeSelector.querySelectorAll',
+  'Storage.length',
+  'Storage.clear',
+  'Storage.getItem',
+  'Storage.key',
+  'Storage.removeItem',
+  'Storage.setItem',
   'Window.getComputedStyle',
 ])
 
 _manually_generated_html_members = set([
   'Document.querySelectorAll',
   'Document.querySelector',
 ])
 
 # Members from the standard dom that exist in the dart:html library with
 # identical functionality but with cleaner names.
@@ skipping 1634 matching lines @@
     # dispatch has removed f(X), leaving only f(Y), but there is no guarantee
     # that Y = Z-X, so we need to check for Y.
     true_code = emitter.Emit(
         '$(INDENT)if ($COND) {\n'
         '$!TRUE'
         '$(INDENT)}\n',
         COND=test, INDENT=indent)
     self.GenerateDispatch(
         true_code, info, indent + '  ', position + 1, positive)
     return True