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

ui/aura/window.cc

Index: ui/aura/window.cc
diff --git a/ui/aura/window.cc b/ui/aura/window.cc
index c1e41de4500d02dfa6d233e9cfce1bb83ea9ff22..26d52bbd5c603ae02c90e36ebceb075843ee5f14 100644
--- a/ui/aura/window.cc
+++ b/ui/aura/window.cc
@@ -24,7 +24,6 @@ using internal::RootWindow;
 
 Window::Window(WindowDelegate* delegate)
     : delegate_(delegate),
-      visible_(false),
       parent_(NULL),
       id_(-1),
       user_data_(NULL) {
@@ -60,6 +59,8 @@ void Window::Init() {
   if (delegate_)
     type = ui::Layer::LAYER_HAS_TEXTURE;
   layer_.reset(new ui::Layer(Desktop::GetInstance()->compositor(), type));
+  // Windows (and therefor the layer) should initially be hidden.
+  layer_->SetVisible(false);

[Ben Goodger (Google), 2011/10/05 01:44:09]

therefore

also, I think we should make control-type windows initially visible. but we
don't have window types yet... so can you just drop a TODO here?

   layer_->set_delegate(this);
 }
 
@@ -76,6 +77,10 @@ void Window::Hide() {
   }
 }
 
+bool Window::IsVisible() const {
+  return layer_->IsDrawn();
+}
+
 void Window::SetLayoutManager(LayoutManager* layout_manager) {
   layout_manager_.reset(layout_manager);
 }
@@ -205,7 +210,7 @@ Window* Window::GetEventHandlerForPoint(const gfx::Point& point) {
   Windows::const_reverse_iterator i = children_.rbegin();
   for (; i != children_.rend(); ++i) {
     Window* child = *i;
-    if (!child->visible())
+    if (!child->IsVisible())
       continue;
     gfx::Point point_in_child_coords(point);
     Window::ConvertPointToWindow(this, child, &point_in_child_coords);
@@ -223,7 +228,7 @@ internal::FocusManager* Window::GetFocusManager() {
 }
 
 void Window::SetCapture() {
-  if (!visible_)
+  if (!IsVisible())
     return;
 
   RootWindow* root = GetRoot();
@@ -260,12 +265,11 @@ internal::RootWindow* Window::GetRoot() {
 }
 
 void Window::SetVisible(bool visible) {
-  if (visible_ == visible)
-    return;
-
-  visible_ = visible;
-  layer_->SetVisible(visible_);
-  SchedulePaint();
+  bool was_visible = IsVisible();
+  layer_->SetVisible(visible);
+  bool is_visible = IsVisible();
+  if (was_visible != is_visible)
+    SchedulePaint();
 }
 
 void Window::SchedulePaint() {