Fixing node.nodes.addAll to accept node lists.

tools/dom/templates/html/impl/impl_Node.darttemplate

 // 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.
 
 part of $LIBRARYNAME;
 
 /**
  * Lazy implementation of the child nodes of an element that does not request
  * the actual child nodes of an element until strictly necessary greatly
  * improving performance for the typical cases where it is not required.
@@ skipping 51 matching lines @@
   void add(Node value) {
     _this.$dom_appendChild(value);
   }
 
   void addLast(Node value) {
     _this.$dom_appendChild(value);
   }
 
 
   void addAll(Iterable<Node> iterable) {
+    if (iterable is _ChildNodeListLazy) {
+      iterable = new List.from(iterable);
+    }
     for (Node node in iterable) {
       _this.$dom_appendChild(node);
     }
   }
 
   Node removeLast() {
     final result = last;
     if (result != null) {
       _this.$dom_removeChild(result);
     }
@@ skipping 198 matching lines @@
       final Node parent = this.parentNode;
       parent.$dom_replaceChild(otherNode, this);
     } catch (e) {
 
     };
     return this;
   }
 
 $!MEMBERS
 }