Add hooks to allow lock screen app pages in sign-in profile

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 037d706848990afbb50a0c62ec1329e4e6eed802..93ab332c9bf6b6cfc3acad91afbd28ea89715d2c 100644
--- a/chrome/browser/profiles/profile_manager.cc
+++ b/chrome/browser/profiles/profile_manager.cc
@@ -1207,6 +1207,11 @@ void ProfileManager::DoFinalInitForServices(Profile* profile,
       chromeos::ProfileHelper::IsSigninProfile(profile)) {
     extensions_enabled = true;
   }
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          chromeos::switches::kEnableLockScreenApps) &&
+      chromeos::ProfileHelper::IsSigninProfile(profile)) {
+    extensions_enabled = true;
+  }
 #endif
   extensions::ExtensionSystem::Get(profile)->InitForRegularProfile(
       extensions_enabled);