chromeos: Convert system tray session length limit to mojo

ash/session/session_controller.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 ASH_SESSION_SESSION_CONTROLLER_H_
 #define ASH_SESSION_SESSION_CONTROLLER_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "ash/login_status.h"
 #include "ash/public/cpp/session_types.h"
 #include "ash/public/interfaces/session_controller.mojom.h"
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
+#include "base/time/time.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 
 class AccountId;
 
 namespace ash {
 
 class SessionObserver;
 
 // Implements mojom::SessionController to cache session related info such as
 // session state, meta data about user sessions to support synchronous
 // queries for ash. It is targeted as a replacement for SessionStateDelegate.
 class ASH_EXPORT SessionController
     : NON_EXPORTED_BASE(public mojom::SessionController) {
  public:
   SessionController();
   ~SessionController() override;
 
+  base::TimeDelta session_length_limit() const { return session_length_limit_; }
+  base::TimeTicks session_start_time() const { return session_start_time_; }
+
   // Binds the mojom::SessionControllerRequest to this object.
   void BindRequest(mojom::SessionControllerRequest request);
 
   // Returns the number of signed in users. If 0 is returned, there is either
   // no session in progress or no active user.
   int NumberOfLoggedInUsers() const;
 
   // Gets the policy of adding a user session to ash.
   AddUserSessionPolicy GetAddUserPolicy() const;
 
@@ skipping 70 matching lines @@
   // mojom::SessionController
   void SetClient(mojom::SessionControllerClientPtr client) override;
   void SetSessionInfo(mojom::SessionInfoPtr info) override;
   void UpdateUserSession(mojom::UserSessionPtr user_session) override;
   void SetUserSessionOrder(
       const std::vector<uint32_t>& user_session_order) override;
   void StartLock(StartLockCallback callback) override;
   void NotifyChromeLockAnimationsComplete() override;
   void RunUnlockAnimation(RunUnlockAnimationCallback callback) override;
   void NotifyChromeTerminating() override;
+  void SetSessionLengthLimit(base::TimeDelta length_limit,
+                             base::TimeTicks start_time) override;
 
   // Test helpers.
   void ClearUserSessionsForTest();
   void FlushMojoForTest();
   void LockScreenAndFlushForTest();
 
  private:
   void SetSessionState(session_manager::SessionState state);
   void AddUserSession(mojom::UserSessionPtr user_session);
 
@@ skipping 36 matching lines @@
   // Last known login status. Used to track login status changes.
   LoginStatus login_status_ = LoginStatus::NOT_LOGGED_IN;
 
   // Whether unlocking is in progress. The flag is set when the pre-unlock
   // animation starts and reset when session state is no longer LOCKED.
   bool is_unlocking_ = false;
 
   // Pending callback for the StartLock request.
   base::OnceCallback<void(bool)> start_lock_callback_;
 
+  // The session length limit; set to zero if there is no limit.
+  base::TimeDelta session_length_limit_;
+
+  // The session start time, set at login or on the first user activity; set to
+  // null if there is no session length limit. This value is also stored in a
+  // pref in case of a crash during the session.
+  base::TimeTicks session_start_time_;
+
   base::ObserverList<ash::SessionObserver> observers_;
 
   base::WeakPtrFactory<SessionController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SESSION_SESSION_CONTROLLER_H_