Implement support for monitor suspend.

chromeos/dbus/power_manager_client.h

Index: chromeos/dbus/power_manager_client.h
diff --git a/chromeos/dbus/power_manager_client.h b/chromeos/dbus/power_manager_client.h
index 70ac0da0eaf3842e510082f15c87f2306c035ef5..54d42fef397594c9efc7e20e98fa30bdb05725dd 100644
--- a/chromeos/dbus/power_manager_client.h
+++ b/chromeos/dbus/power_manager_client.h
@@ -26,6 +26,7 @@ namespace chromeos {
 typedef base::Callback<void(int64)> CalculateIdleTimeCallback;
 typedef base::Callback<void(void)> IdleNotificationCallback;
 typedef base::Callback<void(uint32)> PowerStateRequestIdCallback;
+typedef base::Callback<void(void)> SuspendImminentCallback;

[Daniel Erat, 2013/01/08 00:51:35]

nit: you don't need this, do you?

[marcheu, 2013/01/10 01:03:49]

Removed.

 
 // Callback used for getting the current screen brightness.  The param is in the
 // range [0.0, 100.0].
@@ -67,6 +68,9 @@ class CHROMEOS_EXPORT PowerManagerClient {
     // (as opposed to the more-common method of adjusting the backlight).
     virtual void ScreenDimmingRequested(ScreenDimmingState state) {}
 
+    // Called when the system suspends.

[Daniel Erat, 2013/01/08 00:51:35]

nit: i'd add a bit more details about this:

// Called when the system is about to suspend.  Suspend is
// deferred until all observers' implementations of this
// method have finished running.

[marcheu, 2013/01/10 01:03:49]

Done.

+    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