Replace BoxDimensions with sky.Size

sky/examples/raw/sector-layout.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 'package:sky/framework/app.dart';
 import 'package:sky/framework/layout2.dart';
 
 const double kTwoPi = 2 * math.PI;
@@ skipping 380 matching lines @@
     _child = value;
     adoptChild(_child);
     markNeedsLayout();
   }
 
   void setParentData(RenderNode child) {
     if (child.parentData is! SectorParentData)
       child.parentData = new SectorParentData();
   }
 
-  BoxDimensions getIntrinsicDimensions(BoxConstraints constraints) {
+  sky.Size getIntrinsicDimensions(BoxConstraints constraints) {
     if (child == null)
-      return new BoxDimensions.withConstraints(constraints, width: 0.0, height: 0.0);
+      return constraints.constrain(new sky.Size(0.0, 0.0));
     assert(child is RenderSector);
     assert(child.parentData is SectorParentData);
     assert(!constraints.isInfinite);
     double maxChildDeltaRadius = math.min(constraints.maxWidth, constraints.maxHeight) / 2.0 - innerRadius;
     SectorDimensions childDimensions = child.getIntrinsicDimensions(new SectorConstraints(maxDeltaRadius: maxChildDeltaRadius), innerRadius);
     double dimension = (innerRadius + childDimensions.deltaRadius) * 2.0;
-    return new BoxDimensions.withConstraints(constraints, width: dimension, height: dimension);
+    return constraints.constrain(new sky.Size(dimension, dimension));
   }
 
   void performLayout() {
     if (child == null) {
       size = constraints.constrain(new sky.Size(0.0, 0.0));
     } else {
       assert(child is RenderSector);
       assert(!constraints.isInfinite);
       double maxChildDeltaRadius = math.min(constraints.maxWidth, constraints.maxHeight) / 2.0 - innerRadius;
       assert(child.parentData is SectorParentData);
@@ skipping 75 matching lines @@
   rootCircle.add(new RenderSolidColor(0xFF0000FF, desiredDeltaTheta: kTwoPi * 0.4));
   var stack = new RenderSectorSlice(padding: 2.0);
   stack.add(new RenderSolidColor(0xFFFFFF00, desiredDeltaRadius: 20.0));
   stack.add(new RenderSolidColor(0xFFFF9000, desiredDeltaRadius: 20.0));
   stack.add(new RenderSolidColor(0xFF00FF00));
   rootCircle.add(stack);
 
   var root = new RenderBoxToRenderSectorAdapter(innerRadius: 50.0, child: rootCircle);
   app = new AppView(root);
 }