Use BubbleWindow for ChromeOS windows/dialogs.

chrome/browser/views/window.h

+// Copyright (c) 2010 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_VIEWS_WINDOW_H_
+#define CHROME_BROWSER_VIEWS_WINDOW_H_
+#pragma once
+
+#include "gfx/native_widget_types.h"
+
+namespace gfx {
+class Rect;
+}
+
+namespace views {
+class Window;
+class WindowDelegate;
+}
+
+namespace browser {
+
+// Create a window for given |delegate| using default frame view.
+views::Window* CreateViewsWindow(gfx::NativeWindow parent,
+                                 const gfx::Rect& bounds,
+                                 views::WindowDelegate* delegate);
+
+}  // namespace browser
+
+#endif  // CHROME_BROWSER_VIEWS_WINDOW_H_