chromeos: Turn off displays on suspend

ui/display/chromeos/display_configurator.h

 // Copyright 2014 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 UI_DISPLAY_CHROMEOS_DISPLAY_CONFIGURATOR_H_
 #define UI_DISPLAY_CHROMEOS_DISPLAY_CONFIGURATOR_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 378 matching lines @@
 
   // Pending requests. These values are used when triggering the next display
   // configuration.
   //
   // Stores the user requested state or INVALID if nothing was requested.
   MultipleDisplayState requested_display_state_;
 
   // Stores the requested power state.
   chromeos::DisplayPowerState requested_power_state_;
 
+  // The display power state before suspend.
+  chromeos::DisplayPowerState saved_power_state_;
+
   // True if |requested_power_state_| has been changed due to a user request.
   bool requested_power_state_change_;
 
   // Bitwise-or value of the |kSetDisplayPower*| flags defined above.
   int requested_power_flags_;
 
   // List of callbacks from callers waiting for the display configuration to
   // start/finish. Note these callbacks belong to the pending request, not a
   // request currently active.
   std::vector<ConfigurationCallback> queued_configuration_callbacks_;
@@ skipping 51 matching lines @@
 
   // This must be the last variable.
   base::WeakPtrFactory<DisplayConfigurator> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayConfigurator);
 };
 
 }  // namespace ui
 
 #endif  // UI_DISPLAY_CHROMEOS_DISPLAY_CONFIGURATOR_H_