Add policy for limiting the session length

chrome/browser/chromeos/session_length_limiter_factory.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_SESSION_LENGTH_LIMITER_FACTORY_H_
+#define CHROME_BROWSER_CHROMEOS_SESSION_LENGTH_LIMITER_FACTORY_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/singleton.h"
+#include "chrome/browser/profiles/profile_keyed_service_factory.h"
+
+class Profile;
+
+namespace chromeos {
+
+class SessionLengthLimiter;
+class SessionLengthLimiterTest;
+
+class SessionLengthLimiterFactory : public ProfileKeyedServiceFactory {
+ public:
+  static SessionLengthLimiterFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<SessionLengthLimiterFactory>;
+  friend class SessionLengthLimiterTest;
+
+  SessionLengthLimiterFactory();
+  virtual ~SessionLengthLimiterFactory();
+
+  // ProfileKeyedServiceFactory:
+  virtual ProfileKeyedService* BuildServiceInstanceFor(
+      Profile* profile) const OVERRIDE;
+  virtual void RegisterUserPrefs(PrefService* prefs) OVERRIDE;
+  virtual bool ServiceIsCreatedWithProfile() const OVERRIDE;
+  virtual bool ServiceIsNULLWhileTesting() const OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(SessionLengthLimiterFactory);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_SESSION_LENGTH_LIMITER_FACTORY_H_