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

third_party/polymer/v1_0/components/paper-toggle-button/paper-toggle-button.css

 /*
 @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 87 matching lines @@
   opacity: 1;
 }
 
 #ink {
   position: absolute;
   top: -14px;
   left: -14px;
   width: 48px;
   height: 48px;
   opacity: 0.5;
+  pointer-events: none;
 }