Display "Restart to update" dialog to Chrome OS users.

chrome/browser/ui/ash/system_tray_delegate_chromeos.h

 // Copyright 2013 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_UI_ASH_SYSTEM_TRAY_DELEGATE_CHROMEOS_H_
 #define CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_DELEGATE_CHROMEOS_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 52 matching lines @@
       public chrome::BrowserListObserver,
       public extensions::AppWindowRegistry::Observer,
       public user_manager::UserManager::UserSessionStateObserver,
       public SupervisedUserServiceObserver,
       public input_method::InputMethodManager::ImeMenuObserver {
  public:
   SystemTrayDelegateChromeOS();
 
   ~SystemTrayDelegateChromeOS() override;
 
+  // Access a global pointer to the single instance of the
+  // SystemTrayDelegateChromeOS class.
+  static SystemTrayDelegateChromeOS* instance();
+
   void InitializeOnAdapterReady(
       scoped_refptr<device::BluetoothAdapter> adapter);
 
   // Overridden from ash::SystemTrayDelegate:
   void Initialize() override;
   ash::LoginStatus GetUserLoginStatus() const override;
   std::string GetEnterpriseDomain() const override;
   std::string GetEnterpriseRealm() const override;
   base::string16 GetEnterpriseMessage() const override;
   std::string GetSupervisedUserManager() const override;
@@ skipping 33 matching lines @@
       ash::CustodianInfoTrayObserver* observer) override;
   std::unique_ptr<ash::SystemTrayItem> CreateRotationLockTrayItem(
       ash::SystemTray* tray) override;
 
   // Overridden from user_manager::UserManager::UserSessionStateObserver:
   void UserAddedToSession(const user_manager::User* active_user) override;
   void ActiveUserChanged(const user_manager::User* active_user) override;
 
   void UserChangedChildStatus(user_manager::User* user) override;
 
+  // This notifies the system that a flash update is now available, and so the
+  // user should reboot.
+  void SetFlashUpdateAvailable();
+  bool GetFlashUpdateAvailable();
+
  private:
   ash::SystemTrayNotifier* GetSystemTrayNotifier();
 
   void SetProfile(Profile* profile);
 
   bool UnsetProfile(Profile* profile);
 
   void UpdateShowLogoutButtonInTray();
 
   void UpdateLogoutDialogDuration();
@@ skipping 92 matching lines @@
   Profile* user_profile_ = nullptr;
   int search_key_mapped_to_ = input_method::kSearchKey;
   bool have_session_start_time_ = false;
   base::TimeTicks session_start_time_;
   bool have_session_length_limit_ = false;
   base::TimeDelta session_length_limit_;
   std::string enterprise_domain_;
   std::string enterprise_realm_;
   bool should_run_bluetooth_discovery_ = false;
   bool session_started_ = false;
+  bool flash_update_available_ = false;
 
   scoped_refptr<device::BluetoothAdapter> bluetooth_adapter_;
   std::unique_ptr<device::BluetoothDiscoverySession>
       bluetooth_discovery_session_;
   std::unique_ptr<ash::NetworkingConfigDelegate> networking_config_delegate_;
   std::unique_ptr<AccessibilityStatusSubscription> accessibility_subscription_;
 
   base::ObserverList<ash::CustodianInfoTrayObserver>
       custodian_info_changed_observers_;
 
   base::WeakPtrFactory<SystemTrayDelegateChromeOS> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayDelegateChromeOS);
 };
 
 ash::SystemTrayDelegate* CreateSystemTrayDelegate();
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_DELEGATE_CHROMEOS_H_