help: add important animation to Chrome logo.

chrome/browser/resources/help/help_page.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 cr.define('help', function() {
   var Page = cr.ui.pageManager.Page;
   var PageManager = cr.ui.pageManager.PageManager;
 
   /**
    * Encapsulated handling of the About page. Called 'help' internally to avoid
@@ skipping 139 matching lines @@
         channelChangeDisallowedError.appendChild(channelChangeDisallowedText);
 
         $('channel-change-disallowed-icon').onclick = function() {
           PageManager.showBubble(channelChangeDisallowedError,
                                  $('channel-change-disallowed-icon'),
                                  $('help-container'),
                                  cr.ui.ArrowLocation.TOP_END);
         };
       }
 
+      var logo = $('product-logo');
+      logo.onclick = function(e) {
+        logo.classList.remove('spin');
+        setTimeout(function() { logo.classList.add('spin'); });
+      };
+
       // Attempt to update.
       chrome.send('onPageLoaded');
     },
 
     /** @override */
     didClosePage: function() {
       this.setMoreInfoVisible_(false);
     },
 
     /**
@@ skipping 460 matching lines @@
 
   HelpPage.setBuildDate = function(buildDate) {
     HelpPage.getInstance().setBuildDate_(buildDate);
   };
 
   // Export
   return {
     HelpPage: HelpPage
   };
 });