Implement support for monitor suspend.

chromeos/display/output_configurator.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_DISPLAY_OUTPUT_CONFIGURATOR_H_
 #define CHROMEOS_DISPLAY_OUTPUT_CONFIGURATOR_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 83 matching lines @@
   // to our own reconfiguration operations so spurious events are common.
   // Spurious events will have no effect.
   virtual bool Dispatch(const base::NativeEvent& event) OVERRIDE;
 
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // 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();
 
   // Returns a vector filled with properties of the first two connected outputs
   // found on |display| and |screen|.
   std::vector<OutputSnapshot> GetDualOutputs(Display* display,
                                              XRRScreenResources* screen);
 
   // Looks for a mode on internal and external outputs having same resolution.
@@ skipping 87 matching lines @@
 
   // Indicates the time at which |output_state_| was entered.
   base::TimeTicks last_enter_state_time_;
 
   DISALLOW_COPY_AND_ASSIGN(OutputConfigurator);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DISPLAY_OUTPUT_CONFIGURATOR_H_