Revert of Remove webkitConvertPointFromPageToNode() and webkitConvertPointFromNodeToPage()

Source/core/frame/Window.idl

Index: Source/core/frame/Window.idl
diff --git a/Source/core/frame/Window.idl b/Source/core/frame/Window.idl
index f9f7d3ef98f564fda9bcd7f824220ae0c0668e8d..e82990ce7f1f09249c731af952cdd748d0c2ed8b 100644
--- a/Source/core/frame/Window.idl
+++ b/Source/core/frame/Window.idl
@@ -148,6 +148,11 @@
 
     [Replaceable] readonly attribute double devicePixelRatio;
 
+    [MeasureAs=PrefixedConvertPointFromPageToNode] WebKitPoint webkitConvertPointFromPageToNode([Default=Undefined] optional Node node,
+                                                                                                [Default=Undefined] optional WebKitPoint p);
+    [MeasureAs=PrefixedConvertPointFromNodeToPage] WebKitPoint webkitConvertPointFromNodeToPage([Default=Undefined] optional Node node,
+                                                                                                [Default=Undefined] optional WebKitPoint p);
+
     [RuntimeEnabled=ApplicationCache, LogActivity=GetterOnly] readonly attribute ApplicationCache applicationCache;
 
     [RuntimeEnabled=SessionStorage, LogActivity=GetterOnly, RaisesException=Getter] readonly attribute Storage sessionStorage;