[Effen] Move 'flex' out of CSS also. (mark II)

sky/framework/fn.dart

Index: sky/framework/fn.dart
diff --git a/sky/framework/fn.dart b/sky/framework/fn.dart
index 1a1118c07e56a04fcb7f0cf7d067e53e6d3bef28..29caedab9276e9801743d4acb639129d1846c760 100644
--- a/sky/framework/fn.dart
+++ b/sky/framework/fn.dart
@@ -148,6 +148,12 @@ class StyleNode extends ContentNode {
   StyleNode(UINode content, this.style): super(content);
 }
 
+class ParentDataNode extends ContentNode {
+  final ParentData parentData;
+
+  ParentDataNode(UINode content, this.parentData): super(content);
+}
+
 /*
  * SkyNodeWrappers correspond to a desired state of a RenderCSS. They are fully
  * immutable, with one exception: A UINode which is a Component which lives within
@@ -389,14 +395,28 @@ abstract class SkyElementWrapper extends SkyNodeWrapper {
     List<Style> styles = new List<Style>();
     if (style != null)
       styles.add(style);
+    ParentData parentData = null;
     UINode parent = _parent;
     while (parent != null && parent is! SkyNodeWrapper) {
       if (parent is StyleNode && parent.style != null)
         styles.add(parent.style);
+      else
+      if (parent is ParentDataNode && parent.parentData != null) {
+        if (parentData != null)
+          parentData.merge(parent.parentData); // this will throw if the types aren't the same
+        else
+          parentData = parent.parentData;
+      }
       parent = parent._parent;
     }
     _root.updateStyles(styles);
-
+    if (parentData != null) {
+      assert(_root.parentData != null);
+      _root.parentData.merge(parentData); // this will throw if the types aren't approriate
+      assert(parent != null);
+      assert(parent._root != null);
+      parent._root.markNeedsLayout();
+    }
     _root.updateInlineStyle(inlineStyle);
 
     _syncChildren(oldSkyElementWrapper);