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

content/shell/minimal_ash.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_SHELL_MINIMAL_ASH_H_
 #define CONTENT_SHELL_MINIMAL_ASH_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/client/stacking_client.h"
 
 namespace aura {
 class RootWindow;
 class Window;
 namespace client {
 class DefaultCaptureClient;
 class FocusClient;
 }
 namespace test {
 class TestActivationClient;
 }
 }
 
 namespace gfx {
 class Rect;
+class Size;
 }
 
 namespace views {
 namespace corewm {
 class CompoundEventFilter;
 class InputMethodEventFilter;
 }
 }
 
 namespace content {
 
 // Creates a minimal environment for running the shell. We can't pull in all of
 // ash here, but we can create attach several of the same things we'd find in
 // the ash parts of the code.
 class MinimalAsh : public aura::client::StackingClient {
  public:
-  MinimalAsh();
+  explicit MinimalAsh(const gfx::Size& default_window_size);
   virtual ~MinimalAsh();
 
   // Overridden from client::StackingClient:
   virtual aura::Window* GetDefaultParent(aura::Window* context,
                                          aura::Window* window,
                                          const gfx::Rect& bounds) OVERRIDE;
 
  private:
   scoped_ptr<aura::RootWindow> root_window_;
 
   // Owned by RootWindow
   views::corewm::CompoundEventFilter* root_window_event_filter_;
 
   scoped_ptr<aura::client::DefaultCaptureClient> capture_client_;
   scoped_ptr<views::corewm::InputMethodEventFilter> input_method_filter_;
   scoped_ptr<aura::test::TestActivationClient> test_activation_client_;
   scoped_ptr<aura::client::FocusClient> focus_client_;
 
   DISALLOW_COPY_AND_ASSIGN(MinimalAsh);
 };
 
 }  // namespace content;
 
 #endif  // CONTENT_SHELL_MINIMAL_ASH_H_