Fix the Sky tests

sky/sdk/lib/framework/rendering/object.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import '../node.dart';
 import '../scheduler.dart' as scheduler;
 import 'dart:math' as math;
 import 'dart:sky' as sky;
 import 'dart:sky' show Point, Size, Rect, Color, Paint, Path;
 export 'dart:sky' show Point, Size, Rect, Color, Paint, Path;
@@ skipping 101 matching lines @@
     if (_relayoutSubtreeRoot != this) {
       final parent = this.parent; // TODO(ianh): Remove this once the analyzer is cleverer
       assert(parent is RenderObject);
       parent.markNeedsLayout();
       assert(parent == this.parent); // TODO(ianh): Remove this once the analyzer is cleverer
     } else {
       _nodesNeedingLayout.add(this);
       scheduler.ensureVisualUpdate();
     }
   }
+  void scheduleInitialLayout() {
+    assert(attached);
+    assert(parent == null);
+    assert(_relayoutSubtreeRoot == null);
+    _relayoutSubtreeRoot = this;
+    _nodesNeedingLayout.add(this);
+    scheduler.ensureVisualUpdate();
+  }
   static void flushLayout() {
     _debugDoingLayout = true;
     List<RenderObject> dirtyNodes = _nodesNeedingLayout;
     _nodesNeedingLayout = new List<RenderObject>();
     dirtyNodes..sort((a, b) => a.depth - b.depth)..forEach((node) {
       if (node._needsLayout && node.attached)
         node._doLayout();
     });
     _debugDoingLayout = false;
   }
@@ skipping 311 matching lines @@
     int count = 1;
     ChildType child = _firstChild;
     while (child != null) {
       result += '${prefix}child ${count}: ${child.toString(prefix)}';
       count += 1;
       child = child.parentData.nextSibling;
     }
     return result;
   }
 }