Enable login screen apps.

chrome/browser/profiles/profile_manager.cc

Index: chrome/browser/profiles/profile_manager.cc
diff --git a/chrome/browser/profiles/profile_manager.cc b/chrome/browser/profiles/profile_manager.cc
index 0c4229c8eb8db14d8d3625af514b2d39dfb0202c..c50dac04170c77b9090d5246873e58d7720e1b38 100644
--- a/chrome/browser/profiles/profile_manager.cc
+++ b/chrome/browser/profiles/profile_manager.cc
@@ -1211,8 +1211,16 @@ void ProfileManager::DoFinalInitForServices(Profile* profile,
   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