Enable WebUI ScreenLocker for aura by abstracting lock window.

chrome/browser/chromeos/login/lock_window_aura.h

Index: chrome/browser/chromeos/login/lock_window_aura.h
diff --git a/chrome/browser/chromeos/login/lock_window_aura.h b/chrome/browser/chromeos/login/lock_window_aura.h
new file mode 100644
index 0000000000000000000000000000000000000000..4478dcfd1ec04273bd37f697a0f4a8a736488208
--- /dev/null
+++ b/chrome/browser/chromeos/login/lock_window_aura.h
@@ -0,0 +1,36 @@
+// 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_WINDOW_AURA_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_WINDOW_AURA_H_
+#pragma once
+
+#include "base/compiler_specific.h"
+#include "chrome/browser/chromeos/login/lock_window.h"
+#include "ui/views/widget/widget.h"
+
+namespace chromeos {
+
+class LockWindowAura : public views::Widget,
+                       public LockWindow {
+ public:
+  // LockWindow implementation:
+  virtual void Grab(DOMView* dom_view) OVERRIDE;
+  virtual views::Widget* GetWidget() OVERRIDE;
+
+ private:
+  friend class LockWindow;
+
+  LockWindowAura();
+  virtual ~LockWindowAura();
+
+  // Initialize the Aura lock window.
+  void Init();
+
+  DISALLOW_COPY_AND_ASSIGN(LockWindowAura);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_WINDOW_AURA_H_