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

sky/tests/resources/display_list.dart

 
 import 'dart:sky' as sky;
+import "dart:sky.internals" as internals;
 
 import 'package:sky/rendering/box.dart';
 import 'package:sky/rendering/object.dart';
 
 typedef void Logger (String s);
 
 class TestDisplayList extends RenderObjectDisplayList {
   TestDisplayList(double width, double height, this.logger, { this.indent: '' }) :
     this.width = width,
     this.height = height,
@@ skipping 122 matching lines @@
     RenderObject.debugDoingPaint = true;
     frame += 1;
     lastPaint = '';
     log("PAINT FOR FRAME #${frame} ----------------------------------------------");
     var canvas = new TestDisplayList(rootConstraints.width, rootConstraints.height, log, indent: "${frame} |");
     paint(canvas);
     log("------------------------------------------------------------------------");
     RenderObject.debugDoingPaint = false;
   }
 
+  // TEST API:
+
   void checkFrame() {
     RenderObject.flushLayout();
     paintFrame();
     print(lastPaint); // TODO(ianh): figure out how to make this fit the unit testing framework better
   }
 
+  void endTest() {
+    internals.notifyTestComplete("PAINTED $frame FRAMES");
+  }
+
 }