update components

dashboard-ui/bower_components/iron-form-element-behavior/iron-form-element-behavior.html

@@ -10,16 +10,13 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
 
 <link rel="import" href="../polymer/polymer.html">
 
-<!--
-Enables a custom element to be included in an `iron-form`.
--->
 <script>
-
   /**
+  Polymer.IronFormElementBehavior enables a custom element to be included
+  in an `iron-form`.
 
   @demo demo/index.html
   @polymerBehavior
-
   */
   Polymer.IronFormElementBehavior = {
 
@@ -51,6 +48,19 @@ Enables a custom element to be included in an `iron-form`.
         type: String
       },
 
+      /**
+       * Set to true to mark the input as required. If used in a form, a
+       * custom element that uses this behavior should also use
+       * Polymer.IronValidatableBehavior and define a custom validation method.
+       * Otherwise, a `required` element will always be considered valid.
+       * It's also strongly recomended to provide a visual style for the element
+       * when it's value is invalid.
+       */
+      required: {
+        type: Boolean,
+        value: false
+      },
+
       /**
        * The form that the element is registered to.
        */