Implement support for monitor suspend.

chromeos/display/output_configurator.h

Index: chromeos/display/output_configurator.h
diff --git a/chromeos/display/output_configurator.h b/chromeos/display/output_configurator.h
index abb89c376a890e2747f2d3604868eddace36c4fb..418668e5cf899a1051464610829a8328deb36d3f 100644
--- a/chromeos/display/output_configurator.h
+++ b/chromeos/display/output_configurator.h
@@ -101,6 +101,11 @@ class CHROMEOS_EXPORT OutputConfigurator : public MessageLoop::Dispatcher {
   // Tells if the output specified by |name| is for internal display.
   static bool IsInternalOutputName(const std::string& name);
 
+  // Set all the displays into pre-suspend mode; usually this means configure
+  // them for their resume state. This allows faster resume on machines where
+  // display configuration is slow.
+  void SuspendDisplays();
+
  private:
   // Fires OnDisplayModeChanged() event to the observers.
   void NotifyOnDisplayChanged();