Add policy for limiting the session length

chrome/common/pref_names.cc

 // 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.
 
 #include "chrome/common/pref_names.h"
 
 #include "base/basictypes.h"
 
 namespace prefs {
 
@@ skipping 48 matching lines @@
 // The URLs to restore on startup or when the home button is pressed. The URLs
 // are only restored on startup if kRestoreOnStartup is 4.
 const char kURLsToRestoreOnStartup[] = "session.urls_to_restore_on_startup";
 
 // A preference to keep track of whether we have already checked whether we
 // need to migrate the user from kRestoreOnStartup=0 to kRestoreOnStartup=4.
 // We only need to do this check once, on upgrade from m18 or lower to m19 or
 // higher.
 const char kRestoreOnStartupMigrated[] = "session.restore_on_startup_migrated";
 
+#if defined(OS_CHROMEOS)

[Mattias Nissler (ping if slow), 2012/12/12 10:12:57]

ditto

[bartfab (slow), 2012/12/13 16:22:48]

Done.

+// A preference to keep track of the session start time. The value is set
+// after login. When the browser restarts after a crash, the pref value is not
+// changed unless it appears corrupted (value unset, value lying in the future,
+// zero value).
+const char kSessionStartTime[] = "session.start_time";
+
+// Holds the maximum session time in milliseconds. If this pref is set, the
+// user is logged out when the maximum session time is reached. The user is
+// informed about the remaining time by a countdown timer shown in the ash
+// system tray.
+const char kSessionLengthLimit[] = "session.length_limit";
+#endif
+
 // Disables screenshot accelerators and extension APIs.
 // This setting resides both in profile prefs and local state. Accelerator
 // handling code reads local state, while extension APIs use profile pref.
 const char kDisableScreenshots[] = "disable_screenshots";
 
 // The application locale.
 // For OS_CHROMEOS we maintain kApplicationLocale property in both local state
 // and user's profile.  Global property determines locale of login screen,
 // while user's profile determines his personal locale preference.
 const char kApplicationLocale[] = "intl.app_locale";
@@ skipping 2096 matching lines @@
 // 64-bit serialization of the time last policy usage statistics were collected
 // by UMA_HISTOGRAM_ENUMERATION.
 const char kLastPolicyStatisticsUpdate[] = "policy.last_statistics_update";
 
 #if defined(OS_CHROMEOS)
 // The RLZ brand code, if enabled.
 const char kRLZBrand[] = "rlz.brand";
 #endif
 
 }  // namespace prefs