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

content/shell/minimal_ash.cc

 // 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.
 
 #include "content/shell/minimal_ash.h"
 
 #include "ui/aura/client/default_capture_client.h"
 #include "ui/aura/focus_manager.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/test/test_activation_client.h"
 #include "ui/views/corewm/compound_event_filter.h"
 #include "ui/views/corewm/input_method_event_filter.h"
 
 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);
 
   focus_client_.reset(new aura::FocusManager);
   aura::client::SetFocusClient(root_window_.get(), focus_client_.get());
 
   root_window_event_filter_ = new views::corewm::CompoundEventFilter;
   // Pass ownership of the filter to the root_window.
   root_window_->SetEventFilter(root_window_event_filter_);
 
@@ skipping 15 matching lines @@
 }
 
 aura::Window* MinimalAsh::GetDefaultParent(
     aura::Window* context,
     aura::Window* window,
     const gfx::Rect& bounds) {
   return root_window_.get();
 }
 
 }  // namespace content