[Search] Tweak the styling for the first-run experience

chrome/browser/resources/contextual_search/promo.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.
 */
 
 /**
  * On load, registers the handler to add the 'hide' class to the container
  * element in order to hide it.
  */
 window.onload = function() {
   $('optin-label').addEventListener('click', function() {
     $('container').classList.add('hide');
   });
 };
+
+/**
+ * Returns the height of the content. Method called from Chrome to properly size
+ * the view embedding it.
+ * @return {number} The height of the content, in pixels.
+ */
+function getContentHeight() {
+  return $('container').clientHeight;
+}