Implement support for monitor suspend.

chromeos/dbus/power_manager_client.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 CHROMEOS_DBUS_POWER_MANAGER_CLIENT_H_
 #define CHROMEOS_DBUS_POWER_MANAGER_CLIENT_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 49 matching lines @@
     // structure that contains the current state of the power supply.
     virtual void PowerChanged(const PowerSupplyStatus& status) {}
 
     // Called when we go idle for threshold time.
     virtual void IdleNotify(int64 threshold_secs) {}
 
     // Called when a request is received to dim or undim the screen in software
     // (as opposed to the more-common method of adjusting the backlight).
     virtual void ScreenDimmingRequested(ScreenDimmingState state) {}
 
+    // Called when the system is about to suspend. Suspend is deferred until
+    // all observers' implementations of this method have finished running.
+    virtual void SuspendImminent() {}
+
     // Called when the power button is pressed or released.
     // Note: Implement both this method and
     // RootPowerManagerObserver::OnPowerButtonEvent() until this has been moved
     // to powerd: http://crosbug.com/36804
     virtual void PowerButtonEventReceived(bool down,
                                           const base::TimeTicks& timestamp) {}
 
     // Called when the device's lid is opened or closed.
     // Note: Implement both this method and
     // RootPowerManagerObserver::OnLidEvent() until this has been moved
@@ skipping 114 matching lines @@
   // Create() should be used instead.
   PowerManagerClient();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PowerManagerClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_POWER_MANAGER_CLIENT_H_