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

sky/examples/stocks2/lib/stock_app.dart

Index: sky/examples/stocks2/lib/stock_app.dart
diff --git a/sky/examples/stocks2/lib/stock_app.dart b/sky/examples/stocks2/lib/stock_app.dart
index 6e13b0b4ecc2e5cf2d343ae6dc92b7005ce8fb8b..be617539f1a7968aa0087ed071b2d58210154e38 100644
--- a/sky/examples/stocks2/lib/stock_app.dart
+++ b/sky/examples/stocks2/lib/stock_app.dart
@@ -216,6 +216,6 @@ void main() {
   App app = new StocksApp();
   UINodeAppView.appView.onFrame = () {
     // uncomment this for debugging:
-    // app.appView.debugDumpRenderTree();
+    // UINodeAppView.appView.debugDumpRenderTree();
   };
 }