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

third_party/polymer/v1_0/components/paper-spinner/paper-spinner.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 81 matching lines @@
         </div><div class="circle-clipper right">
           <div class="circle"></div>
         </div>
       </div>
     </div>
 
   </template>
 
   <script>
 
-    (function() {
+    Polymer({
 
-      'use strict';
+      is: 'paper-spinner',
 
-      function classNames(obj) {
-        var classNames = [];
-        for (var key in obj) {
-          if (obj.hasOwnProperty(key) && obj[key]) {
-            classNames.push(key);
-          }
+      listeners: {
+        'animationend': 'reset',
+        'webkitAnimationEnd': 'reset'
+      },
+
+      properties: {
+
+        /**
+         * Displays the spinner.
+         *
+         * @attribute active
+         * @type boolean
+         * @default false
+         */
+        active: {
+          type: Boolean,
+          value: false,
+          reflectToAttribute: true,
+          observer: '_activeChanged'
+        },
+
+        /**
+         * Alternative text content for accessibility support.
+         * If alt is present, it will add an aria-label whose content matches alt when active.
+         * If alt is not present, it will default to 'loading' as the alt value.
+         *
+         * @attribute alt
+         * @type string
+         * @default 'loading'
+         */
+        alt: {
+          type: String,
+          value: 'loading',
+          observer: '_altChanged'
+        },
+
+        /**
+         * True when the spinner is going from active to inactive. This is represented by a fade
+         * to 0% opacity to the user.
+         */
+        _coolingDown: {
+          type: Boolean,
+          value: false
+        },
+
+        _spinnerContainerClassName: {
+          type: String,
+          computed: '_computeSpinnerContainerClassName(active, _coolingDown)'
         }
 
-        return classNames.join(' ');
+      },
+
+      _computeSpinnerContainerClassName: function(active, coolingDown) {
+        return [
+          active || coolingDown ? 'active' : '',
+          coolingDown ? 'cooldown' : ''
+        ].join(' ');
+      },
+
+      _activeChanged: function(active, old) {
+        this._setAriaHidden(!active);
+        if (!active && old) {
+          this._coolingDown = true;
+        }
+      },
+
+      _altChanged: function(alt) {
+        // user-provided `aria-label` takes precedence over prototype default
+        if (alt === this.getPropertyInfo('alt').value) {
+          this.alt = this.getAttribute('aria-label') || alt;
+        } else {
+          this._setAriaHidden(alt==='');
+          this.setAttribute('aria-label', alt);
+        }
+      },
+
+      _setAriaHidden: function(hidden) {
+        var attr = 'aria-hidden';
+        if (hidden) {
+          this.setAttribute(attr, 'true');
+        } else {
+          this.removeAttribute(attr);
+        }
+      },
+
+      reset: function() {
+        this.active = false;
+        this._coolingDown = false;
       }
 
-      Polymer({
-
-        is: 'paper-spinner',
-
-        listeners: {
-          'animationend': 'reset',
-          'webkitAnimationEnd': 'reset'
-        },
-
-        properties: {
-
-          /**
-           * Displays the spinner.
-           *
-           * @attribute active
-           * @type boolean
-           * @default false
-           */
-          active: {
-            observer: '_activeChanged',
-            type: Boolean,
-            value: false
-          },
-
-          /**
-           * Alternative text content for accessibility support.
-           * If alt is present, it will add an aria-label whose content matches alt when active.
-           * If alt is not present, it will default to 'loading' as the alt value.
-           *
-           * @attribute alt
-           * @type string
-           * @default 'loading'
-           */
-          alt: {
-            observer: '_altChanged',
-            type: String,
-            value: 'loading'
-          },
-
-          /**
-           * True when the spinner is going from active to inactive. This is represented by a fade
-           * to 0% opacity to the user.
-           */
-          _coolingDown: {
-            type: Boolean,
-            value: false
-          },
-
-          _spinnerContainerClassName: {
-            type: String,
-            computed: '_computeSpinnerContainerClassName(active, _coolingDown)'
-          }
-
-        },
-
-        _computeSpinnerContainerClassName: function(active, _coolingDown) {
-          return classNames({
-            active: active || _coolingDown,
-            cooldown: _coolingDown
-          });
-        },
-
-        ready: function() {
-          // Allow user-provided `aria-label` take preference to any other text alternative.
-          if (this.hasAttribute('aria-label')) {
-            this.alt = this.getAttribute('aria-label');
-          } else {
-            this.setAttribute('aria-label', this.alt);
-          }
-
-          if (!this.active) {
-            this.setAttribute('aria-hidden', 'true');
-          }
-        },
-
-        _activeChanged: function() {
-          if (this.active) {
-            this.removeAttribute('aria-hidden');
-          } else {
-            this._coolingDown = true;
-            this.setAttribute('aria-hidden', 'true');
-          }
-        },
-
-        _altChanged: function() {
-          if (this.alt === '') {
-            this.setAttribute('aria-hidden', 'true');
-          } else {
-            this.removeAttribute('aria-hidden');
-          }
-
-          this.setAttribute('aria-label', this.alt);
-        },
-
-        reset: function() {
-          this.active = false;
-          this._coolingDown = false;
-        }
-
-      });
-
-    }());
+    });
 
   </script>
 
 </dom-module>