Enable login screen apps.

chrome/browser/extensions/chrome_process_manager_delegate.cc

Index: chrome/browser/extensions/chrome_process_manager_delegate.cc
diff --git a/chrome/browser/extensions/chrome_process_manager_delegate.cc b/chrome/browser/extensions/chrome_process_manager_delegate.cc
index e5804aab7c89b436ade61cc18225ba081b7f3229..d4af8644128c34e0d9b0f937cf8635f666ed2ae6 100644
--- a/chrome/browser/extensions/chrome_process_manager_delegate.cc
+++ b/chrome/browser/extensions/chrome_process_manager_delegate.cc
@@ -9,6 +9,7 @@
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
+#include "chrome/browser/extensions/extension_management.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/browser.h"
@@ -19,8 +20,13 @@
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/process_manager.h"
 #include "extensions/browser/process_manager_factory.h"
+#include "extensions/common/extension.h"
 #include "extensions/common/one_shot_event.h"
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/profiles/profile_helper.h"
+#endif
+
 namespace extensions {
 
 ChromeProcessManagerDelegate::ChromeProcessManagerDelegate() {
@@ -39,14 +45,41 @@ ChromeProcessManagerDelegate::~ChromeProcessManagerDelegate() {
 }
 
 bool ChromeProcessManagerDelegate::IsBackgroundPageAllowed(
-    content::BrowserContext* context) const {
+    content::BrowserContext* context,
+    const Extension* extension) const {
   Profile* profile = static_cast<Profile*>(context);
 
   bool is_normal_session = !profile->IsGuestSession() &&
                            !profile->IsSystemProfile();
+
 #if defined(OS_CHROMEOS)
-  is_normal_session = is_normal_session &&
-                      user_manager::UserManager::Get()->IsUserLoggedIn();
+  const bool is_signin_profile =
+      chromeos::ProfileHelper::IsSigninProfile(profile) &&
+      !profile->IsOffTheRecord();
+
+  if (is_signin_profile) {
+    // If an extension is specified, allow background pages only if that
+    // extension is in the login screen app list. Otherwise allow
+    // background pages.
+    if (!extension)
+      return true;
+
+    // Check for flag.
+    const bool login_screen_apps_enabled =
+        base::CommandLine::ForCurrentProcess()->HasSwitch(
+            switches::kEnableLoginScreenApps);
+
+    // Get login screen apps installed by policy.
+    std::unique_ptr<base::DictionaryValue> login_screen_apps_list =
+        ExtensionManagementFactory::GetForBrowserContext(context)
+            ->GetForceInstallList();
+
+    return login_screen_apps_enabled &&
+           login_screen_apps_list->HasKey(extension->id());
+  }
+
+  is_normal_session =
+      is_normal_session && user_manager::UserManager::Get()->IsUserLoggedIn();
 #endif
 
   // Disallow if the current session is a Guest mode session or login screen but