Add boxShadow to BoxDecoration#toString

sky/sdk/lib/framework/rendering/box.dart

Index: sky/sdk/lib/framework/rendering/box.dart
diff --git a/sky/sdk/lib/framework/rendering/box.dart b/sky/sdk/lib/framework/rendering/box.dart
index 3b2ac5ab2b32e3caf3a4957d05069442c2aec4e5..7765bf034d9d9d08b1d3a84074e570b6e391495a 100644
--- a/sky/sdk/lib/framework/rendering/box.dart
+++ b/sky/sdk/lib/framework/rendering/box.dart
@@ -662,8 +662,10 @@ class BoxDecoration {
       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');