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 783 matching lines @@
 const char kSecondaryDisplayLayout[] = "settings.display.secondary_layout";
 
 // An integer pref that specifies how far the secondary display is positioned
 // from the edge of the primary display.
 const char kSecondaryDisplayOffset[] = "settings.display.secondary_offset";
 
 // A dictionary pref that specifies per-display layout/offset information.
 // Its key is the ID of the display and its value is a dictionary for the
 // layout/offset information.
 const char kSecondaryDisplays[] = "settings.display.secondary_displays";
+
+// 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  // defined(OS_CHROMEOS)
 
 // The disabled messages in IPC logging.
 const char kIpcDisabledMessages[] = "ipc_log_disabled_messages";
 
 // A boolean pref set to true if a Home button to open the Home pages should be
 // visible on the toolbar.
 const char kShowHomeButton[] = "browser.show_home_button";
 
 // A string value which saves short list of recently user selected encodings
@@ skipping 1361 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