change the way windows are parented when their parent is set to NULL.

ui/aura_shell/desktop_background_view.cc

 // Copyright (c) 2011 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 "ui/aura_shell/desktop_background_view.h"
 
 #include "base/utf_string_conversions.h"
 #include "grit/ui_resources.h"
 #include "ui/aura/desktop.h"
 #include "ui/aura_shell/aura_shell_export.h"
+#include "ui/aura_shell/shell_window_ids.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/canvas.h"
 #include "views/widget/widget.h"
 
 namespace aura_shell {
 namespace internal {
 
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopBackgroundView, public:
 
 DesktopBackgroundView::DesktopBackgroundView() {
   wallpaper_ = *ResourceBundle::GetSharedInstance().GetBitmapNamed(
       IDR_AURA_WALLPAPER);
 }
 
 DesktopBackgroundView::~DesktopBackgroundView() {
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopBackgroundView, views::View overrides:
 
 void DesktopBackgroundView::OnPaint(gfx::Canvas* canvas) {
   canvas->TileImageInt(wallpaper_, 0, 0, width(), height());
 }
 
-AURA_SHELL_EXPORT views::Widget* CreateDesktopBackground() {
+views::Widget* CreateDesktopBackground() {
   views::Widget* desktop_widget = new views::Widget;
   views::Widget::InitParams params(views::Widget::InitParams::TYPE_CONTROL);
-  params.bounds = gfx::Rect(0, 0, 1024, 768);
+  params.parent = aura::Desktop::GetInstance()->window()->GetChildById(
+      aura_shell::internal::kShellWindowId_DesktopBackgroundContainer);
   DesktopBackgroundView* view = new DesktopBackgroundView;
   params.delegate = view;
   desktop_widget->Init(params);
   desktop_widget->SetContentsView(view);
   desktop_widget->Show();
   desktop_widget->GetNativeView()->set_name("DesktopBackgroundView");
   return desktop_widget;
 }
 
 }  // namespace internal
 }  // namespace aura_shell