Better Z-index support.

ui/aura/desktop.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/desktop.h"
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "ui/aura/desktop_host.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/gfx/compositor/compositor.h"
 #include "ui/gfx/compositor/layer.h"
 
 namespace aura {
 
 // static
 Desktop* Desktop::instance_ = NULL;
 
 Desktop::Desktop()
-    : host_(aura::DesktopHost::Create(gfx::Rect(200, 200, 1280, 1024))),
+    : toplevel_window_container_(NULL),
+      host_(aura::DesktopHost::Create(gfx::Rect(200, 200, 1280, 1024))),
       ALLOW_THIS_IN_INITIALIZER_LIST(schedule_paint_(this)) {
   DCHECK(MessageLoopForUI::current())
       << "The UI message loop must be initialized first.";
   compositor_ = ui::Compositor::Create(this, host_->GetAcceleratedWidget(),
                                        host_->GetSize());
   host_->SetDesktop(this);
   DCHECK(compositor_.get());
   window_.reset(new internal::RootWindow);
 }
 
@@ skipping 44 matching lines @@
 Desktop* Desktop::GetInstance() {
   if (!instance_) {
     instance_ = new Desktop;
     instance_->window_->Init();
     instance_->compositor()->set_root_layer(instance_->window_->layer());
   }
   return instance_;
 }
 
 }  // namespace aura