Add UseCounters for access to and change of Attr's child Text nodes

Source/core/dom/Attr.idl

Index: Source/core/dom/Attr.idl
diff --git a/Source/core/dom/Attr.idl b/Source/core/dom/Attr.idl
index 5c22a7986f1d548b34025d1e5656b780dc6d85b0..fbd83532f842203fdd9a614fe20149f5634214d5 100644
--- a/Source/core/dom/Attr.idl
+++ b/Source/core/dom/Attr.idl
@@ -39,5 +39,10 @@ interface Attr : Node {
     readonly attribute DOMString? prefix;
     readonly attribute DOMString? namespaceURI;
     readonly attribute DOMString? localName;
-};
 
+    // https://www.w3.org/Bugs/Public/show_bug.cgi?id=26609
+

[pdr., 2014/11/18 22:19:48]

Ultranit: can you remove this extra newline?

[philipj_slow, 2014/11/18 22:57:07]

Sure, although I added it deliberately for consistency with the silly still
above :)

+    [MeasureAs=AttrChildAccess] readonly attribute NodeList childNodes;
+    [MeasureAs=AttrChildAccess] readonly attribute Node firstChild;
+    [MeasureAs=AttrChildAccess] readonly attribute Node lastChild;
+};