Moving input device hotplug event processing outside of ui/display

ash/display/display_info.h

Index: ash/display/display_info.h
diff --git a/ash/display/display_info.h b/ash/display/display_info.h
index 70d7e182364bfd143c583063b7b0408fee1fe80b..adcf0482aed59533bd4e94a8afca7b5708d3eed9 100644
--- a/ash/display/display_info.h
+++ b/ash/display/display_info.h
@@ -176,6 +176,10 @@ class ASH_EXPORT DisplayInfo {
     display_modes_.swap(display_modes);
   }
 
+  // Returns the native mode size. If a native mode is not present, return an
+  // empty size.
+  gfx::Size GetNativeModeSize() const;
+
   ui::ColorCalibrationProfile color_profile() const {
     return color_profile_;
   }