[Search] Make the text swoosh away off the screen when the user taps the opt-in link.

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.
-   TODO(mathp): Add some JS here.
 */
+
+/**
+ * Adds the 'slide' class to two elements in order to slide them off the screen.
+ */
+function addSlideClass() {
+  $('container').className += ' slide';

[huangs, 2014/08/11 16:10:51]

Is it standard to use $()?

Use .classList.add('slide'), same below.

[Mathieu, 2014/08/11 21:11:03]

In Chrome files yes, there is a presubmit to use $

+  $('button-container').className += ' slide';
+}