Call ShowRootWindow on NativeWindow's RootWindow to display the window.

content/shell/minimal_ash.cc

Index: content/shell/minimal_ash.cc
diff --git a/content/shell/minimal_ash.cc b/content/shell/minimal_ash.cc
index e1ff94abd8d95b426521059c8a7c93b9ae8d9c96..ccda9fe4082ae7ec14c4d1014f305da992ca6c39 100644
--- a/content/shell/minimal_ash.cc
+++ b/content/shell/minimal_ash.cc
@@ -13,9 +13,11 @@
 
 namespace content {
 
-MinimalAsh::MinimalAsh() {
+MinimalAsh::MinimalAsh(gfx::Size default_window_size) {
   root_window_.reset(new aura::RootWindow(
-      aura::RootWindow::CreateParams(gfx::Rect(100, 100))));
+      aura::RootWindow::CreateParams(
+          gfx::Rect(default_window_size.width(),

[sky, 2013/01/23 22:12:10]

There is a constructor that takes a Size.

[Nayan, 2013/01/23 22:23:10]

Done.

+                    default_window_size.height()))));
   root_window_->Init();
   aura::client::SetStackingClient(root_window_.get(), this);