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

ui/aura/test_desktop_delegate.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/test_desktop_delegate.h"
+
+#include "ui/aura/desktop.h"
+
+namespace aura {
+
+TestDesktopDelegate::TestDesktopDelegate()
+    : default_container_(new ToplevelWindowContainer) {
+  Desktop::GetInstance()->set_delegate(this);

[sky, 2011/10/07 19:59:45]

Unset in the destructor?

+  default_container_->Init();
+  default_container_->SetBounds(
+      gfx::Rect(gfx::Point(), Desktop::GetInstance()->GetSize()));
+  Desktop::GetInstance()->window()->AddChild(default_container_.get());
+  default_container_->Show();
+}
+
+TestDesktopDelegate::~TestDesktopDelegate() {
+}
+
+

[sky, 2011/10/07 19:59:45]

nit: remove one of these.

+void TestDesktopDelegate::AddChildToDefaultParent(Window* window) {
+  default_container_->AddChild(window);
+}
+
+Window* TestDesktopDelegate::GetTopmostWindowToActivate(Window* ignore) const {
+  return default_container_->GetTopmostWindowToActivate(ignore);
+}
+
+}  // namespace aura