help: add important animation to Chrome logo.

chrome/browser/resources/help/help_page.js

Index: chrome/browser/resources/help/help_page.js
diff --git a/chrome/browser/resources/help/help_page.js b/chrome/browser/resources/help/help_page.js
index 4140cd935aa0a721192a6e5c0787d34cc5f0d78c..6a508b4a8a7ea7edbf0d125ce68a7e90726e67ba 100644
--- a/chrome/browser/resources/help/help_page.js
+++ b/chrome/browser/resources/help/help_page.js
@@ -157,6 +157,12 @@ cr.define('help', function() {
         };
       }
 
+      var logo = $('product-logo');
+      logo.onclick = function(e) {
+        logo.classList.remove('spin');
+        setTimeout(function() { logo.classList.add('spin'); });
+      };
+
       // Attempt to update.
       chrome.send('onPageLoaded');
     },