update polymer, nodebind, and templatebinding

pkg/template_binding/lib/src/instance_binding_map.dart

 // 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.
 
 part of template_binding;
 
 class _InstanceBindingMap {
   final List bindings;
   List<_InstanceBindingMap> children;
   DocumentFragment content;
@@ skipping 53 matching lines @@
   if (bindings.isTemplate) {
     TemplateBindExtension.decorate(clone, node);
     if (delegate != null) {
       templateBindFallback(clone).bindingDelegate = delegate;
     }
   }
 
   _processBindings(clone, bindings, model, instanceBindings);
   return clone;
 }
+
+// TODO(rafaelw): Setup a MutationObserver on content which clears the expando
+// so that bindingMaps regenerate when template.content changes.
+_getInstanceBindingMap(DocumentFragment content, BindingDelegate delegate) {
+  if (delegate == null) delegate = BindingDelegate._DEFAULT;
+
+  if (delegate._bindingMaps == null) delegate._bindingMaps = new Expando();
+  var map = delegate._bindingMaps[content];
+  if (map == null) {
+    map = _createInstanceBindingMap(content, delegate);
+    delegate._bindingMaps[content] = map;
+  }
+  return map;
+}