Add policy for fullscreen mode; disallow fullscreen in public sessions

apps/pref_names.cc

 // Copyright 2013 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 "apps/pref_names.h"
 
 namespace apps {
 
 namespace prefs {
 
+// A boolean that tracks whether apps are allowed to enter fullscreen mode.
+extern const char kAppFullscreenAllowed[] =
+    "apps.fullscreen.allowed";
+
 // A boolean that tracks whether the user has ever enabled the app launcher.
 const char kAppLauncherHasBeenEnabled[] =
     "apps.app_launcher.has_been_enabled";
 
 // TODO(calamity): remove this pref since app launcher will always be
 // installed.
 // Local state caching knowledge of whether the app launcher is installed.
 const char kAppLauncherIsEnabled[] =
     "apps.app_launcher.should_show_apps_page";
 
@@ skipping 13 matching lines @@
 // A boolean that indicates whether app shortcuts have been created.
 // On a transition from false to true, shortcuts are created for all apps.
 const char kShortcutsHaveBeenCreated[] = "apps.shortcuts_have_been_created";
 
 // A boolean identifying if we should show the app launcher promo or not.
 const char kShowAppLauncherPromo[] = "app_launcher.show_promo";
 
 }  // namespace prefs
 
 }  // namespace apps