Implement Node.ownerScope

sky/engine/core/dom/Node.idl

Index: sky/engine/core/dom/Node.idl
diff --git a/sky/engine/core/dom/Node.idl b/sky/engine/core/dom/Node.idl
index 7f0e5f8b586f39cfc28d85c150d29c5b43ac7f0b..2fddd0390ddfc5c03b73ef65fe19262c88fe3dad 100644
--- a/sky/engine/core/dom/Node.idl
+++ b/sky/engine/core/dom/Node.idl
@@ -29,6 +29,10 @@
     [PerWorldBindings] readonly attribute Node             nextSibling;
     [PerWorldBindings] readonly attribute Document         ownerDocument;
 
+    // TODO(esprehn): This should return TreeScope in Sky, but we don't have
+    // a TreeScope type yet.
+    readonly attribute Node ownerScope;
+
     [CustomElementCallbacks, PerWorldBindings, RaisesException, TypeChecking=Interface] Node insertBefore(Node newChild, Node? refChild);
     [CustomElementCallbacks, PerWorldBindings, RaisesException, TypeChecking=Interface] Node replaceChild(Node newChild, Node oldChild);
     [CustomElementCallbacks, RaisesException, TypeChecking=Interface] Node removeChild(Node oldChild);