chromeos: Add delay between screen off and lock.

chromeos/dbus/power_policy_controller.h

Index: chromeos/dbus/power_policy_controller.h
diff --git a/chromeos/dbus/power_policy_controller.h b/chromeos/dbus/power_policy_controller.h
index 6aa3f716ec119a7b3cf1e5c3e88704acb1737703..ce5ed05512003f52e4dfcab7161e7e89532b3d91 100644
--- a/chromeos/dbus/power_policy_controller.h
+++ b/chromeos/dbus/power_policy_controller.h
@@ -61,6 +61,12 @@ class CHROMEOS_EXPORT PowerPolicyController
   static std::string GetPolicyDebugString(
       const power_manager::PowerManagementPolicy& policy);
 
+  // Delay in milliseconds between the screen being turned off and the
+  // screen being locked. Used if the |enable_screen_lock| pref is set but
+  // |*_screen_lock_delay_ms| are unset or set to higher values than what
+  // this constant would imply.
+  const static int kScreenLockAfterOffDelayMs;
+
   PowerPolicyController(DBusThreadManager* manager, PowerManagerClient* client);
   virtual ~PowerPolicyController();