Update bower.json for Polymer elements and add PRESUBMIT.py

third_party/polymer/v1_0/components/iron-validatable-behavior/iron-validatable-behavior.html

 <!--
 @license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 -->
 
@@ skipping 73 matching lines @@
      */
     hasValidator: function() {
       return this._validator != null;
     },
 
     /**
      * @param {Object} values Passed to the validator's `validate()` function.
      * @return {boolean} True if `values` is valid.
      */
     validate: function(values) {
-      var valid = this._validator && this._validator.validate(values);
+      var valid = true;
+      if (this.hasValidator()) {
+        valid = this._validator.validate(values);
+      }
+
       this.invalid = !valid;
       return valid;
     }
 
   };
 
 </script>