Introduce RenderProxyBox and RenderSizedBox

sky/sdk/lib/framework/components2/scaffold.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 '../fn2.dart';
 import '../layout2.dart';
 import '../theme/typography.dart' as typography;
 import 'dart:sky' as sky;
 
 // RenderNode
@@ skipping 78 matching lines @@
 
   static const kToolbarHeight = 100.0;
   static const kStatusbarHeight = 50.0;
   static const kButtonX = -16.0; // from right edge of body
   static const kButtonY = -16.0; // from bottom edge of body
 
   void performLayout() {
     double bodyHeight = size.height;
     double bodyPosition = 0.0;
     if (toolbar != null) {
-      toolbar.layout(new BoxConstraints.tight(width: size.width, height: kToolbarHeight));
+      toolbar.layout(new BoxConstraints.tight(new sky.Size(size.width, kToolbarHeight)));
       assert(toolbar.parentData is BoxParentData);
       toolbar.parentData.position = new sky.Point(0.0, 0.0);
       bodyPosition = kToolbarHeight;
       bodyHeight -= kToolbarHeight;
     }
     if (statusbar != null) {
-      statusbar.layout(new BoxConstraints.tight(width: size.width, height: kStatusbarHeight));
+      statusbar.layout(new BoxConstraints.tight(new sky.Size(size.width, kStatusbarHeight)));
       assert(statusbar.parentData is BoxParentData);
       statusbar.parentData.position = new sky.Point(0.0, size.height - kStatusbarHeight);
       bodyHeight -= kStatusbarHeight;
     }
     if (body != null) {
-      body.layout(new BoxConstraints.tight(width: size.width, height: bodyHeight));
+      body.layout(new BoxConstraints.tight(new sky.Size(size.width, bodyHeight)));
       assert(body.parentData is BoxParentData);
       body.parentData.position = new sky.Point(0.0, bodyPosition);
     }
     if (drawer != null) {
       drawer.layout(new BoxConstraints(minWidth: 0.0, maxWidth: size.width, minHeight: size.height, maxHeight: size.height));
       assert(drawer.parentData is BoxParentData);
       drawer.parentData.position = new sky.Point(0.0, 0.0);
     }
     if (floatingActionButton != null) {
       floatingActionButton.layout(new BoxConstraints(minWidth: 0.0, maxWidth: size.width, minHeight: size.height, maxHeight: size.height));
@@ skipping 91 matching lines @@
   void syncRenderNode(UINode old) {
     super.syncRenderNode(old);
     syncChild(toolbar, old is Scaffold ? old.toolbar : null, #toolbar);
     syncChild(body, old is Scaffold ? old.body : null, #body);
     syncChild(statusbar, old is Scaffold ? old.statusbar : null, #statusbar);
     syncChild(drawer, old is Scaffold ? old.drawer : null, #drawer);
     syncChild(floatingActionButton, old is Scaffold ? old.floatingActionButton : null, #floatingActionButton);
   }
 
 }