Add UseCounters for the reflected SVGElement.xml* attributes

Source/core/svg/SVGElement.idl

Index: Source/core/svg/SVGElement.idl
diff --git a/Source/core/svg/SVGElement.idl b/Source/core/svg/SVGElement.idl
index 55fc6c90860551ea27a9a60675cf3460c6164753..5fce604e74e686aaf8ee3706834f19b2f4d91df1 100644
--- a/Source/core/svg/SVGElement.idl
+++ b/Source/core/svg/SVGElement.idl
@@ -21,12 +21,12 @@
  */
 
 interface SVGElement : Element {
-    [Reflect] attribute DOMString xmlbase;
+    [Reflect, MeasureAs=SVGElementXmlbase] attribute DOMString xmlbase;
     readonly attribute SVGSVGElement? ownerSVGElement;
     readonly attribute SVGElement? viewportElement;
 
-    [Reflect] attribute DOMString xmllang;
-    [Reflect] attribute DOMString xmlspace;
+    [Reflect, MeasureAs=SVGElementXmllang] attribute DOMString xmllang;
+    [Reflect, MeasureAs=SVGElementXmlspace] attribute DOMString xmlspace;
 
     [RuntimeEnabled=SVG1DOM, MeasureAs=SVGClassName] readonly attribute SVGAnimatedString className;