Fix compilation errors in render-sector.dart

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 76 matching lines @@
     result.add(this);
     return true;
   }
   void hitTestChildren(HitTestResult result, { double radius, double theta }) { }
 
   double deltaRadius;
   double deltaTheta;
 }
 
 class RenderDecoratedSector extends RenderSector {
-  BoxDecoration _decoration;
 
   RenderDecoratedSector(BoxDecoration decoration) : _decoration = decoration;
 
   BoxDecoration _decoration;
   BoxDecoration get decoration => _decoration;
   void set decoration (BoxDecoration value) {
     if (value == _decoration)
       return;
     _decoration = value;
     markNeedsPaint();
@@ skipping 397 matching lines @@
   }
 
   void layout(SectorConstraints constraints, { RenderNode relayoutSubtreeRoot }) {
     deltaRadius = constraints.constrainDeltaRadius(desiredDeltaRadius);
     deltaTheta = constraints.constrainDeltaTheta(desiredDeltaTheta);
     layoutDone();
   }
 
   void handlePointer(sky.PointerEvent event) {
     if (event.type == 'pointerdown')
-      setBoxDecoration(new BoxDecoration(backgroundColor: 0xFFFF0000));
+      decoration = new BoxDecoration(backgroundColor: 0xFFFF0000);
     else if (event.type == 'pointerup')
-      setBoxDecoration(new BoxDecoration(backgroundColor: backgroundColor));
+      decoration = new BoxDecoration(backgroundColor: backgroundColor);
   }
 }
 
 AppView app;
 
 void main() {
 
   var rootCircle = new RenderSectorRing(padding: 20.0);
   rootCircle.add(new RenderSolidColor(0xFF00FFFF, desiredDeltaTheta: kTwoPi * 0.15));
   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);
 }