Add aura window as child of lock screen layer rather than setting parent to lock layer.

chrome/browser/chromeos/login/lock_window_aura.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 "chrome/browser/chromeos/login/lock_window_aura.h"
 
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/aura_shell/shell.h"
 #include "ui/aura_shell/shell_window_ids.h"
@@ skipping 23 matching lines @@
   Init();
 }
 
 LockWindowAura::~LockWindowAura() {
 }
 
 void LockWindowAura::Init() {
   views::Widget::InitParams params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
   params.bounds = gfx::Rect(aura::RootWindow::GetInstance()->GetHostSize());
+  views::Widget::Init(params);
   // TODO(flackr): Use a property to specify this container rather than
   // depending on shell implementation.
-  params.parent = aura_shell::Shell::GetInstance()->GetContainer(
-      aura_shell::internal::kShellWindowId_LockScreenContainer);
-  views::Widget::Init(params);
+  aura_shell::Shell::GetInstance()->GetContainer(
+      aura_shell::internal::kShellWindowId_LockScreenContainer)->
+      AddChild(GetNativeView());
 }
 
 }  // namespace chromeos