First run: tweaks to welcome page

chrome/browser/resources/welcome/welcome.js

 // Copyright 2016 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('welcome', function() {
   'use strict';
 
   function onAccept(e) {
     chrome.send('handleActivateSignIn');
   }
 
   function onDecline(e) {
     chrome.send('handleUserDecline');
+    e.preventDefault();
   }
 
   function initialize() {
     $('accept-button').addEventListener('click', onAccept);
     $('decline-button').addEventListener('click', onDecline);
+
+    var logo = document.querySelector('.logo-icon');
+    logo.onclick = function(e) {
+      logo.animate({
+        transform: ['none', 'rotate(-10turn)'],
+      }, /** @type {!KeyframeEffectOptions} */({
+        duration: 500,
+        easing: 'cubic-bezier(1, 0, 0, 1)',
+      }));
+    };
+
+    document.fonts.load('bold .8125em Roboto');
   }
 
   return {
     initialize: initialize
   };
 });
 
 document.addEventListener('DOMContentLoaded', welcome.initialize);