SkyView should handle screen rotation

sky/sdk/lib/framework/rendering/box.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 'dart:math' as math;
 import 'dart:sky' as sky;
 import 'dart:typed_data';
 import 'object.dart';
 import '../painting/shadows.dart';
 import 'package:vector_math/vector_math.dart';
@@ skipping 929 matching lines @@
   }
 
   Size _size = Size.zero;
   double get width => _size.width;
   double get height => _size.height;
 
   int _orientation; // 0..3
   int get orientation => _orientation;
   Duration timeForRotation;
 
+  ViewConstraints _rootConstraints;
+  ViewConstraints get rootConstraints => _rootConstraints;
+  void set rootConstraints(ViewConstraints value) {
+    if (_rootConstraints == value)
+      return;
+    _rootConstraints = value;
+    markNeedsLayout();
+  }
+
   ViewConstraints get constraints => super.constraints as ViewConstraints;
-  bool get sizedByParent => true;
-  void performResize() {
-    if (constraints.orientation != _orientation) {
+
+  void performLayout() {
+    if (_rootConstraints.orientation != _orientation) {
       if (_orientation != null && child != null)
-        child.rotate(oldAngle: _orientation, newAngle: constraints.orientation, time: timeForRotation);
-      _orientation = constraints.orientation;
+        child.rotate(oldAngle: _orientation, newAngle: _rootConstraints.orientation, time: timeForRotation);
+      _orientation = _rootConstraints.orientation;
     }
-    _size = new Size(constraints.width, constraints.height);
+    _size = new Size(_rootConstraints.width, _rootConstraints.height);
     assert(_size.height < double.INFINITY);
     assert(_size.width < double.INFINITY);
-  }
-  void performLayout() {
+
     if (child != null) {
       child.layout(new BoxConstraints.tight(_size));
       assert(child.size.width == width);
       assert(child.size.height == height);
     }
   }
 
   void rotate({ int oldAngle, int newAngle, Duration time }) {
     assert(false); // nobody tells the screen to rotate, the whole rotate() dance is started from our performResize()
   }
@@ skipping 43 matching lines @@
 
   void defaultPaint(RenderObjectDisplayList canvas) {
     RenderBox child = firstChild;
     while (child != null) {
       assert(child.parentData is ParentDataType);
       canvas.paintChild(child, child.parentData.position);
       child = child.parentData.nextSibling;
     }
   }
 }