Integrate About page into Settings for Chrome OS settings in a window.

chrome/browser/resources/options/options.js

 // Copyright (c) 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.
 
 var AddLanguageOverlay = options.AddLanguageOverlay;
 var AlertOverlay = options.AlertOverlay;
 var AutofillEditAddressOverlay = options.AutofillEditAddressOverlay;
 var AutofillEditCreditCardOverlay = options.AutofillEditCreditCardOverlay;
 var AutofillOptions = options.AutofillOptions;
 var AutomaticSettingsResetBanner = options.AutomaticSettingsResetBanner;
@@ skipping 191 matching lines @@
     PageManager.registerOverlay(KeyboardOverlay.getInstance(),
                                 BrowserOptions.getInstance(),
                                 [$('keyboard-settings-button')]);
     PageManager.registerOverlay(PointerOverlay.getInstance(),
                                 BrowserOptions.getInstance(),
                                 [$('pointer-settings-button')]);
     PageManager.registerOverlay(PreferredNetworks.getInstance(),
                                 BrowserOptions.getInstance());
     PageManager.registerOverlay(ThirdPartyImeConfirmOverlay.getInstance(),
                                 LanguageOptions.getInstance());
+    if (loadTimeData.getBoolean('showVersion')) {
+      PageManager.registerOverlay(help.ChannelChangePage.getInstance(),
+                                  help.HelpPage.getInstance());
+      PageManager.registerOverlay(help.HelpPage.getInstance(),
+                                  BrowserOptions.getInstance());
+    }
   }
 
   if (!cr.isWindows && !cr.isMac) {
     PageManager.registerOverlay(CertificateBackupOverlay.getInstance(),
                                 CertificateManager.getInstance());
     PageManager.registerOverlay(CertificateEditCaTrustOverlay.getInstance(),
                                 CertificateManager.getInstance());
     PageManager.registerOverlay(CertificateImportErrorOverlay.getInstance(),
                                 CertificateManager.getInstance());
     PageManager.registerOverlay(CertificateManager.getInstance(),
@@ skipping 43 matching lines @@
 };
 
 /**
  * Listener for the |popstate| event.
  * @param {Event} e The |popstate| event.
  */
 window.onpopstate = function(e) {
   var pageName = PageManager.getPageNameFromPath();
   PageManager.setState(pageName, e.state);
 };