Create an example app that demonstrates interactive coordination of an fn tree and a raw RenderObje…

sky/sdk/lib/widgets/ui_node.dart

Index: sky/sdk/lib/widgets/ui_node.dart
diff --git a/sky/sdk/lib/widgets/ui_node.dart b/sky/sdk/lib/widgets/ui_node.dart
index cdaaf540560ccf1ec8df35d7f71cb6e8e5b1d8fa..0c910f76ef8bf9d0b00888110cd46a6f70e1035a 100644
--- a/sky/sdk/lib/widgets/ui_node.dart
+++ b/sky/sdk/lib/widgets/ui_node.dart
@@ -816,9 +816,9 @@ abstract class App extends AbstractUINodeRoot {
 
 typedef UINode Builder();
 
-class RenderObjectToUINodeAdapter extends AbstractUINodeRoot {
+class RenderBoxToUINodeAdapter extends AbstractUINodeRoot {
 
-  RenderObjectToUINodeAdapter(
+  RenderBoxToUINodeAdapter(
     RenderObjectWithChildMixin<RenderBox> container,
     this.builder
   ) : _container = container, super() {
@@ -855,4 +855,4 @@ class RenderObjectToUINodeAdapter extends AbstractUINodeRoot {
   }
 
   UINode build() => builder();
-}
+}