Adds the touch calibration setting behind a chrome switch

extensions/common/api/system_display.idl

Index: extensions/common/api/system_display.idl
diff --git a/extensions/common/api/system_display.idl b/extensions/common/api/system_display.idl
index bd9654f604ddcfd28183c2d3feb692548ecc6721..97d2c3c995aba90f22325625febda68dfaf5ba2c 100644
--- a/extensions/common/api/system_display.idl
+++ b/extensions/common/api/system_display.idl
@@ -157,6 +157,9 @@ namespace system.display {
     // isSelected=true. Only available on Chrome OS. Will be set to an empty
     // array on other platforms.
     DisplayMode[] modes;
+
+    // True if this display has a touch input device associated with it.
+    boolean hasTouchSupport;
   };
 
   dictionary DisplayProperties {