Move the CSSOM View offset* attributes to HTMLElement

Source/core/html/HTMLElement.idl

Index: Source/core/html/HTMLElement.idl
diff --git a/Source/core/html/HTMLElement.idl b/Source/core/html/HTMLElement.idl
index 85598835381da3affc0d2cc9ed53b4e64e96a3a2..1d20922fdf9fd812597ede6b50274cfbe1d2b776 100644
--- a/Source/core/html/HTMLElement.idl
+++ b/Source/core/html/HTMLElement.idl
@@ -43,7 +43,13 @@ interface HTMLElement : Element {
              attribute boolean spellcheck;
 
     void click();
+
+    // http://dev.w3.org/csswg/cssom-view/#extensions-to-the-htmlelement-interface
+    [ImplementedAs=offsetParentForBindings, PerWorldBindings] readonly attribute Element? offsetParent;
+    readonly attribute long offsetTop;
+    readonly attribute long offsetLeft;
+    readonly attribute long offsetWidth;
+    readonly attribute long offsetHeight;
 };
 
 HTMLElement implements GlobalEventHandlers;
-