Add boxShadow to BoxDecoration#toString

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 'package:vector_math/vector_math.dart';
 import 'package:sky/framework/net/image_cache.dart' as image_cache;
@@ skipping 644 matching lines @@
   final Color backgroundColor;
   final Border border;
   final List<BoxShadow> boxShadow;
 
   String toString([String prefix = '']) {
     List<String> result = [];
     if (backgroundColor != null)
       result.add('${prefix}backgroundColor: $backgroundColor');
     if (border != null)
       result.add('${prefix}border: $border');
-    // if (boxShadow != null)
-    //   result.add('${prefix}boxShadow: $boxShadow');
+    if (boxShadow != null) {
+      for (BoxShadow shadow in boxShadow)
+        result.add('${prefix}boxShadow: $shadow');
+    }
     if (result.isEmpty)
       return '${prefix}<no decorations specified>';
     return result.join('\n');
   }
 }
 
 class RenderDecoratedBox extends RenderProxyBox {
 
   RenderDecoratedBox({
     BoxDecoration decoration,
@@ skipping 330 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;
     }
   }
 }