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 actions recording. It displays a live
+ * 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 for
+ * 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 = Date.now() / 1000;  // in seconds since epoch
+    tr.appendChild(td);
+    table.appendChild(tr);
+  }
+
+  return {
+    observeUserAction: observeUserAction
+  };
+});