Use sky_shell instead of mojo_shell for testing.

sky/tests/resources/display_list.dart

Index: sky/tests/resources/display_list.dart
diff --git a/sky/tests/resources/display_list.dart b/sky/tests/resources/display_list.dart
index 761a4bed362cfb4076c250cb598d58c49a9f297a..248cb1269dd9acfecbc1cb029c81d3c8fb7d42ac 100644
--- a/sky/tests/resources/display_list.dart
+++ b/sky/tests/resources/display_list.dart
@@ -1,13 +1,14 @@
 
 import 'dart:async';
 import 'dart:sky' as sky;
-import "dart:sky.internals" as internals;
 import 'dart:typed_data';
 
 import 'package:sky/widgets/basic.dart';
 import 'package:sky/rendering/box.dart';
 import 'package:sky/rendering/object.dart';
 
+import 'harness.dart';
+
 typedef void Logger (String s);
 
 class TestPaintingCanvas extends PaintingCanvas {
@@ -158,7 +159,7 @@ class TestRenderView extends RenderView {
   }
 
   void endTest() {
-    internals.notifyTestComplete("PAINTED $frame FRAMES");
+    notifyTestComplete("PAINTED $frame FRAMES");
   }
 
 }