Adds code for a new Aura shell.

ui/aura_shell/sample_window.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_shell/sample_window.h"
+
+#include "ui/gfx/canvas.h"
+#include "views/widget/widget.h"
+
+// static
+void SampleWindow::CreateSampleWindow() {
+  views::Widget::CreateWindowWithBounds(new SampleWindow,
+                                        gfx::Rect(120, 150, 400, 300))->Show();
+}
+
+SampleWindow::SampleWindow() {
+}
+
+SampleWindow::~SampleWindow() {
+}
+
+void SampleWindow::OnPaint(gfx::Canvas* canvas) {
+  canvas->FillRectInt(SK_ColorDKGRAY, 0, 0, width(), height());
+}
+
+std::wstring SampleWindow::GetWindowTitle() const {
+  return L"Sample Window";
+}
+
+views::View* SampleWindow::GetContentsView() {
+  return this;
+}