ash: Use enum for SessionController::CycleActiveUser

chrome/browser/ui/ash/session_controller_client.h

 // Copyright 2016 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_SESSION_CONTROLLER_CLIENT_H_
 #define CHROME_BROWSER_UI_ASH_SESSION_CONTROLLER_CLIENT_H_
 
 #include "ash/public/interfaces/session_controller.mojom.h"
 #include "base/macros.h"
 #include "components/session_manager/core/session_manager_observer.h"
@@ skipping 16 matching lines @@
       public user_manager::UserManager::UserSessionStateObserver,
       public user_manager::UserManager::Observer,
       public session_manager::SessionManagerObserver {
  public:
   SessionControllerClient();
   ~SessionControllerClient() override;
 
   // ash::mojom::SessionControllerClient:
   void RequestLockScreen() override;
   void SwitchActiveUser(const AccountId& account_id) override;
-  void CycleActiveUser(bool next_user) override;
+  void CycleActiveUser(ash::CycleUserDirection direction) override;
 
   // user_manager::UserManager::UserSessionStateObserver:
   void ActiveUserChanged(const user_manager::User* active_user) override;
   void UserAddedToSession(const user_manager::User* added_user) override;
 
   // user_manager::UserManager::Observer
   void OnUserImageChanged(const user_manager::User& user) override;
 
   // session_manager::SessionManagerObserver:
   void OnSessionStateChanged() override;
 
   // TODO(xiyuan): Remove after SessionStateDelegateChromeOS is gone.
   static bool CanLockScreen();
   static bool ShouldLockScreenAutomatically();
   static ash::AddUserSessionPolicy GetAddUserSessionPolicy();
   static void DoLockScreen();
   static void DoSwitchActiveUser(const AccountId& account_id);
-  static void DoCycleActiveUser(bool next_user);
+  static void DoCycleActiveUser(ash::CycleUserDirection direction);
 
   // Flushes the mojo pipe to ash.
   static void FlushForTesting();
 
  private:
   // Connects or reconnects to the |session_controller_| interface and set
   // this object as its client.
   void ConnectToSessionControllerAndSetClient();
 
   // Sends session info to ash.
@@ skipping 13 matching lines @@
 
   // Whether the primary user session info is sent to ash.
   bool primary_user_session_sent_ = false;
 
   ash::mojom::SessionInfoPtr last_sent_session_info_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionControllerClient);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_SESSION_CONTROLLER_CLIENT_H_