Makes visbility inherited. That is, in order for a window to be

ui/aura/window.h

Index: ui/aura/window.h
diff --git a/ui/aura/window.h b/ui/aura/window.h
index 3065fb5485b1964ef1563f73b1b92eb188014632..0916c2a14c7054841a5badd1a1f4814428e36423 100644
--- a/ui/aura/window.h
+++ b/ui/aura/window.h
@@ -62,7 +62,8 @@ class AURA_EXPORT Window : public ui::LayerDelegate {
   // Changes the visibility of the window.
   void Show();
   void Hide();
-  bool visible() const { return visible_; }
+  // Returns true if this window and all its ancestors are visible.
+  bool IsVisible() const;
 
   // Assigns a LayoutManager to size and place child windows.
   // The Window takes ownership of the LayoutManager.
@@ -179,8 +180,6 @@ class AURA_EXPORT Window : public ui::LayerDelegate {
 
   WindowDelegate* delegate_;
 
-  bool visible_;
-
   scoped_ptr<ui::Layer> layer_;
 
   // The Window's parent.