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

content/shell/shell_aura.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/shell.h"
 
 #include "base/command_line.h"
 #include "base/utf_string_conversions.h"
 #include "content/public/browser/web_contents.h"
 #include "ui/aura/env.h"
@@ skipping 260 matching lines @@
 using views::ShellWindowDelegateView;
 
 namespace content {
 
 #if defined(OS_CHROMEOS)
 MinimalAsh* Shell::minimal_ash_ = NULL;
 #endif
 views::ViewsDelegate* Shell::views_delegate_ = NULL;
 
 // static
-void Shell::PlatformInitialize() {
+void Shell::PlatformInitialize(const gfx::Size& default_window_size) {
 #if defined(OS_CHROMEOS)
   chromeos::DBusThreadManager::Initialize();
 #endif
 #if defined(OS_CHROMEOS)

[sky, 2013/01/25 00:59:05]

Sorry, since you're here can you merge these two defines, meaning nuke lines 284
and 285.

   gfx::Screen::SetScreenInstance(
       gfx::SCREEN_TYPE_NATIVE, new aura::TestScreen);
-  minimal_ash_ = new content::MinimalAsh();
+  minimal_ash_ = new content::MinimalAsh(default_window_size);
 #else
   gfx::Screen::SetScreenInstance(
       gfx::SCREEN_TYPE_NATIVE, views::CreateDesktopScreen());
 #endif
   views_delegate_ = new ShellViewsDelegateAura();
 }
 
 void Shell::PlatformExit() {
 #if defined(OS_CHROMEOS)
   if (minimal_ash_)
@@ skipping 41 matching lines @@
           new ShellWindowDelegateView(this),
           minimal_ash_->GetDefaultParent(NULL, NULL, gfx::Rect()),
           gfx::Rect(0, 0, width, height));
 #else
   window_widget_ =
       views::Widget::CreateWindowWithBounds(new ShellWindowDelegateView(this),
                gfx::Rect(0, 0, width, height));
 #endif
 
   window_ = window_widget_->GetNativeWindow();
+  // Call ShowRootWindow on RootWindow created by MinimalAsh without
+  // which XWindow owned by RootWindow doesn't get mapped.
+  window_->GetRootWindow()->ShowRootWindow();
   window_widget_->Show();
 }
 
 void Shell::PlatformSetContents() {
   ShellWindowDelegateView* delegate_view =
     static_cast<ShellWindowDelegateView*>(window_widget_->widget_delegate());
   delegate_view->SetWebContents(web_contents_.get());
 }
 
 void Shell::PlatformResizeSubViews() {
 }
 
 void Shell::Close() {
   window_widget_->Close();
 }
 
 void Shell::PlatformSetTitle(const string16& title) {
   ShellWindowDelegateView* delegate_view =
     static_cast<ShellWindowDelegateView*>(window_widget_->widget_delegate());
   delegate_view->SetWindowTitle(title);
   window_widget_->UpdateWindowTitle();
 }
 
 }  // namespace content