Adds code for a new Aura shell.

ui/aura_shell/sample_window.h

+// 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 UI_AURA_SHELL_SAMPLE_WINDOW_H_
+#define UI_AURA_SHELL_SAMPLE_WINDOW_H_
+#pragma once
+
+#include "views/widget/widget_delegate.h"
+
+class SampleWindow : public views::WidgetDelegateView {
+ public:
+  static void CreateSampleWindow();
+
+ private:
+  SampleWindow();
+  virtual ~SampleWindow();
+
+  // Overridden from views::View:
+  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+
+  // Overridden from views::WidgetDelegate:
+  virtual std::wstring GetWindowTitle() const OVERRIDE;
+  virtual View* GetContentsView() OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(SampleWindow);
+};
+
+
+#endif  // UI_AURA_SHELL_SAMPLE_WINDOW_H_