Introduce ash mojo interface for lock screen action handlers

chrome/browser/chromeos/chrome_browser_main_chromeos.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_CHROME_BROWSER_MAIN_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_CHROME_BROWSER_MAIN_CHROMEOS_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "chrome/browser/chrome_browser_main_linux.h"
 #include "chrome/browser/chromeos/external_metrics.h"
 #include "chrome/browser/memory/memory_kills_monitor.h"
 #include "chromeos/system/version_loader.h"
 
+namespace lock_screen_apps {
+class StateController;
+}
+
 namespace session_manager {
 class SessionManager;
 }
 
 namespace arc {
 class ArcServiceLauncher;
 }
 
 namespace chromeos {
 
@@ skipping 64 matching lines @@
 
   scoped_refptr<chromeos::ExternalMetrics> external_metrics_;
 
   std::unique_ptr<arc::ArcServiceLauncher> arc_service_launcher_;
 
   std::unique_ptr<LowDiskNotification> low_disk_notification_;
   std::unique_ptr<ArcKioskAppManager> arc_kiosk_app_manager_;
 
   std::unique_ptr<memory::MemoryKillsMonitor::Handle> memory_kills_monitor_;
 
+  std::unique_ptr<lock_screen_apps::StateController>
+      lock_screen_apps_state_controller_;
+
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainPartsChromeos);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CHROME_BROWSER_MAIN_CHROMEOS_H_