Adds about:user-actions page.

chrome/browser/resources/user_actions/user_actions.js

+// Copyright 2012 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.
+
+/**
+ * Javascript for user_actions.html, served from chrome://user-actions/
+ * This is used to debug user actons recording.  It displays a live

[arv (Not doing code reviews), 2012/11/21 15:09:08]

s/acton/action/

[arv (Not doing code reviews), 2012/11/21 15:09:08]

Single space after .

[Mark P, 2012/11/21 16:05:45]

Done.

[Mark P, 2012/11/21 16:05:45]

Done.

+ * stream of all user action events that occur in chromium while the
+ * chrome://user-actions/ page is open.
+ *
+ * The simple object defined in this javascript file listens from

[arv (Not doing code reviews), 2012/11/21 15:09:08]

listens for

[Mark P, 2012/11/21 16:05:45]

Done.

+ * callbacks from the C++ code saying that a new user action was seen.
+ */
+
+cr.define('userActions', function() {
+  'user strict';
+
+  /**
+   * Appends a row to the output table listing the user action observed
+   * and the current timestamp.
+   * @param {string} userAction the name of the user action observed.
+   */
+  function observeUserAction(userAction) {
+    var table = $('user-actions-table');
+    var tr = document.createElement('tr');
+    var td = document.createElement('td');
+    td.textContent = userAction;
+    tr.appendChild(td);
+    td = document.createElement('td');
+    td.textContent = new Date().getTime() / 1000;  // in seconds since epoch

[arv (Not doing code reviews), 2012/11/21 15:09:08]

Date.now()

[Mark P, 2012/11/21 16:05:45]

Done.

+    tr.appendChild(td);
+    table.appendChild(tr);
+  }
+
+  return {
+    observeUserAction: observeUserAction
+  };
+});