big update to observe, template_binding, polymer

pkg/template_binding/lib/src/binding_delegate.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.
 
 library template_binding.src.binding_delegate;
 
 import 'dart:html';
 import 'package:template_binding/template_binding.dart' show TemplateInstance;
 
 /**
@@ skipping 48 matching lines @@
   PrepareInstanceModelFunction prepareInstanceModel(Element template) => null;
 
   /**
    * Returns a function that will be called whenever the position of an item
    * inside this template changes.
    */
   PrepareInstancePositionChangedFunction prepareInstancePositionChanged(
       Element template) => null;
 }
 
-typedef PrepareBindingFunction(model, Node node);
+typedef PrepareBindingFunction(model, Node node, bool oneTime);
 
 typedef PrepareInstanceModelFunction(model);
 
 typedef PrepareInstancePositionChangedFunction(TemplateInstance instance,
     int index);