Adding about:flags option to enable guest mode.

chrome/browser/about_flags.cc

 // 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.
 
 #include "chrome/browser/about_flags.h"
 
 #include <algorithm>
 #include <iterator>
 #include <map>
 #include <set>
@@ skipping 859 matching lines @@
     SINGLE_VALUE_TYPE(switches::kEnableTouchpadThreeFingerSwipe)
   },
 #endif
   {
     "use-web-based-signin-flow",
     IDS_FLAGS_USE_WEB_BASED_SIGNIN_FLOW_NAME,
     IDS_FLAGS_USE_WEB_BASED_SIGNIN_FLOW_DESCRIPTION,
     kOsMac | kOsWin | kOsLinux,
     SINGLE_VALUE_TYPE(switches::kUseWebBasedSigninFlow)
   },
+  {
+    "enable-desktop-guest-mode",
+    IDS_FLAGS_DESKTOP_GUEST_MODE_NAME,
+    IDS_FLAGS_DESKTOP_GUEST_MODE_DESCRIPTION,
+    kOsMac | kOsWin | kOsLinux,
+    SINGLE_VALUE_TYPE(switches::kEnableDesktopGuestMode)
+  },
 #if defined(USE_ASH)
   {
     "show-launcher-alignment-menu",
     IDS_FLAGS_SHOW_LAUNCHER_ALIGNMENT_MENU_NAME,
     IDS_FLAGS_SHOW_LAUNCHER_ALIGNMENT_MENU_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kShowLauncherAlignmentMenu)
   },
   {
     "show-touch-hud",
@@ skipping 708 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags