Bindings for CSSOM View smooth scroll API

Source/core/dom/Element.idl

Index: Source/core/dom/Element.idl
diff --git a/Source/core/dom/Element.idl b/Source/core/dom/Element.idl
index 5ce30ecc1616405165346b8a6a125b30ac71fdc9..c130a31e4d3051449d3ec5aecedda309173fc10c 100644
--- a/Source/core/dom/Element.idl
+++ b/Source/core/dom/Element.idl
@@ -70,8 +70,13 @@
     [PerWorldBindings] readonly attribute long clientTop;
     [PerWorldBindings] readonly attribute long clientWidth;
     [PerWorldBindings] readonly attribute long clientHeight;
-    [PerWorldBindings] attribute long scrollLeft;
-    [PerWorldBindings] attribute long scrollTop;
+
+    // FIXME: should be:
+    // [PerWorldBindings] attribute (Dictionary or long) scrollLeft;
+    // [PerWorldBindings] attribute (Dictionary or long) scrollTop;
+    // http://crbug.com/240176
+    [PerWorldBindings, Custom=Setter] attribute long scrollLeft;
+    [PerWorldBindings, Custom=Setter] attribute long scrollTop;
     [PerWorldBindings] readonly attribute long scrollWidth;
     [PerWorldBindings] readonly attribute long scrollHeight;