expose MDV addBindings

tools/dom/src/TemplateBindings.dart

Index: tools/dom/src/TemplateBindings.dart
diff --git a/tools/dom/src/TemplateBindings.dart b/tools/dom/src/TemplateBindings.dart
index 6e064efee4926cac111cf842d35de7e08efe4a08..9841aeebb422479f8f747c2f1020365f24d9b8bf 100644
--- a/tools/dom/src/TemplateBindings.dart
+++ b/tools/dom/src/TemplateBindings.dart
@@ -5,7 +5,7 @@
 part of html;
 
 // This code is a port of Model-Driven-Views:
-// https://github.com/toolkitchen/mdv
+// https://github.com/polymer-project/mdv
 // The code mostly comes from src/template_element.js
 
 typedef void _ChangeHandler(value);
@@ -37,7 +37,7 @@ typedef void _ChangeHandler(value);
  *
  *     TemplateElement.syntax['MySyntax'] = new MySyntax();
  *
- * See <https://github.com/toolkitchen/mdv/blob/master/docs/syntax.md> for more
+ * See <https://github.com/polymer-project/mdv/blob/master/docs/syntax.md> for more
  * information about Custom Syntax.
  */
 // TODO(jmesserly): if this is just one method, a function type would make it
@@ -359,7 +359,7 @@ class _Bindings {
   // apply for template data-binding. HTML attributes are true if they're
   // present. However Dart only treats "true" as true. Since this is HTML we'll
   // use something closer to the HTML rules: null (missing) and false are false,
-  // everything else is true. See: https://github.com/toolkitchen/mdv/issues/59
+  // everything else is true. See: https://github.com/polymer-project/mdv/issues/59
   static bool _toBoolean(value) => null != value && false != value;
 
   static Node _createDeepCloneAndDecorateTemplates(Node node, String syntax) {
@@ -493,6 +493,9 @@ class _Bindings {
       return;
     }
 
+    // If this is a custom element, give the .xtag a change to bind.
+    node = _nodeOrCustom(node);
+
     if (tokens.length == 1 && tokens[0].isBinding) {
       _bindOrDelegate(node, name, model, tokens[0].value, syntax);
       return;
@@ -524,7 +527,7 @@ class _Bindings {
       return newValue.toString();
     };
 
-    _nodeOrCustom(node).bind(name, replacementBinding, 'value');
+    node.bind(name, replacementBinding, 'value');
   }
 
   static void _bindOrDelegate(node, name, model, String path,
@@ -538,7 +541,7 @@ class _Bindings {
       }
     }
 
-    _nodeOrCustom(node).bind(name, model, path);
+    node.bind(name, model, path);
   }
 
   /**