Enable login screen apps.

chrome/browser/profiles/profile_manager.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/profiles/profile_manager.h"
 
 #include <stdint.h>
 
 #include <map>
 #include <set>
@@ skipping 1184 matching lines @@
                                             bool go_off_the_record) {
   TRACE_EVENT0("browser", "ProfileManager::DoFinalInitForServices");
 
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   // Ensure that the HostContentSettingsMap has been created before the
   // ExtensionSystem is initialized otherwise the ExtensionSystem will be
   // registered twice
   HostContentSettingsMap* content_settings_map =
     HostContentSettingsMapFactory::GetForProfile(profile);
 
+  bool extensions_enabled = !go_off_the_record;
+#if defined(OS_CHROMEOS)
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableLoginScreenApps) &&
+      chromeos::ProfileHelper::IsSigninProfile(profile)) {
+    extensions_enabled = true;
+  }
+#endif
   extensions::ExtensionSystem::Get(profile)->InitForRegularProfile(
-      !go_off_the_record);
+      extensions_enabled);
   // During tests, when |profile| is an instance of TestingProfile,
   // ExtensionSystem might not create an ExtensionService.
   // This block is duplicated in the HostContentSettingsMapFactory
   // ::BuildServiceInstanceFor method, it should be called once when both the
   // HostContentSettingsMap and the extension_service are set up.
   if (extensions::ExtensionSystem::Get(profile)->extension_service()) {
     extensions::ExtensionSystem::Get(profile)->extension_service()->
         RegisterContentSettings(content_settings_map);
   }
   // Set the block extensions bit on the ExtensionService. There likely are no
@@ skipping 548 matching lines @@
 
   const base::FilePath new_active_profile_dir =
       found_entry ? found_entry->GetPath() : GenerateNextProfileDirectoryPath();
   FinishDeletingProfile(profile_dir, new_active_profile_dir);
 }
 #endif  // !defined(OS_ANDROID)
 
 ProfileManagerWithoutInit::ProfileManagerWithoutInit(
     const base::FilePath& user_data_dir) : ProfileManager(user_data_dir) {
 }