Revert "Revert "First iteration on custom layout.""

sky/engine/core/dom/Element.idl

Index: sky/engine/core/dom/Element.idl
diff --git a/sky/engine/core/dom/Element.idl b/sky/engine/core/dom/Element.idl
index 26f30ee882d6be0a33a0ed036a75a518632853ed..7026878def2c3b62df048b4bec11b584cd406fce 100644
--- a/sky/engine/core/dom/Element.idl
+++ b/sky/engine/core/dom/Element.idl
@@ -18,6 +18,8 @@
 
   void requestPaint(PaintingCallback callback);
 
+  void setLayoutManager(LayoutCallback callback);
+
   // TODO(abarth): Move to Node.
   readonly attribute CSSStyleDeclaration style;
 
@@ -39,4 +41,9 @@
   readonly attribute long clientTop;
   readonly attribute long clientWidth;
   readonly attribute long clientHeight;
+
+  attribute double x;
+  attribute double y;
+  attribute double width;
+  attribute double height;
 };