chromeos: Turn off displays on suspend

ui/display/chromeos/update_display_configuration_task.h

Index: ui/display/chromeos/update_display_configuration_task.h
diff --git a/ui/display/chromeos/update_display_configuration_task.h b/ui/display/chromeos/update_display_configuration_task.h
index e92faf5d7ff152f94881beff323336c079266b06..b62385c3dc0d1595dd36bf122792b550b2a24dcb 100644
--- a/ui/display/chromeos/update_display_configuration_task.h
+++ b/ui/display/chromeos/update_display_configuration_task.h
@@ -35,6 +35,7 @@ class DISPLAY_EXPORT UpdateDisplayConfigurationTask {
                                  int power_flags,
                                  uint32_t background_color_argb,
                                  bool force_configure,
+                                 bool configure_cached_displays,
                                  const ResponseCallback& callback);
   ~UpdateDisplayConfigurationTask();
 
@@ -47,6 +48,7 @@ class DISPLAY_EXPORT UpdateDisplayConfigurationTask {
   void Run();
 
  private:
+  void OnCachedDisplaysRetrieved(const std::vector<DisplaySnapshot*>& displays);
   // Callback to NativeDisplayDelegate::GetDisplays().
   void OnDisplaysUpdated(const std::vector<DisplaySnapshot*>& displays);
 
@@ -93,6 +95,8 @@ class DISPLAY_EXPORT UpdateDisplayConfigurationTask {
 
   bool force_configure_;
 
+  bool configure_cached_displays_;
+
   // Used to signal that the task has finished.
   ResponseCallback callback_;