Add policy for limiting the session length

chrome/browser/chromeos/login/user_manager.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_LOGIN_USER_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_USER_MANAGER_H_
 
 #include <string>
 
 #include "base/memory/singleton.h"
@@ skipping 172 matching lines @@
   virtual bool IsLoggedInAsGuest() const = 0;
 
   // Returns true if we're logged in as the stub user used for testing on Linux.
   virtual bool IsLoggedInAsStub() const = 0;
 
   // Returns true if we're logged in and browser has been started i.e.
   // browser_creator.LaunchBrowser(...) was called after sign in
   // or restart after crash.
   virtual bool IsSessionStarted() const = 0;
 
+  // Returns true when the browser has crashed and restarted during the current
+  // user's session.
+  virtual bool HasBrowserRestarted() const = 0;
+
   // Returns true if data stored or cached for the user with the given email
   // address outside that user's cryptohome (wallpaper, avatar, OAuth token
   // status, display name, display email) is to be treated as ephemeral.
   virtual bool IsUserNonCryptohomeDataEphemeral(
       const std::string& email) const = 0;
 
   virtual void AddObserver(Observer* obs) = 0;
   virtual void RemoveObserver(Observer* obs) = 0;
 
   virtual void NotifyLocalStateChanged() = 0;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_USER_MANAGER_H_