[Effen] add StyleNode

sky/framework/components/fixed_height_scrollable.dart

Index: sky/framework/components/fixed_height_scrollable.dart
diff --git a/sky/framework/components/fixed_height_scrollable.dart b/sky/framework/components/fixed_height_scrollable.dart
index 500af2e27f6b73f9ce3bf73231eba97c69f55eeb..4b5f86d1dac22c60c5b3b25c7fa428688328d5a2 100644
--- a/sky/framework/components/fixed_height_scrollable.dart
+++ b/sky/framework/components/fixed_height_scrollable.dart
@@ -9,13 +9,9 @@ import 'dart:sky' as sky;
 import 'scrollable.dart';
 
 abstract class FixedHeightScrollable extends Scrollable {
-  // TODO(rafaelw): This component really shouldn't have an opinion
-  // about how it is sized. The owning component should decide whether
-  // it's explicitly sized or flexible or whatever...
   static final Style _style = new Style('''
     overflow: hidden;
     position: relative;
-    flex: 1;
     will-change: transform;'''
   );