views: Add an empty menu bar.

atom/browser/ui/views/menu_layout.h

@@ -0,0 +1,32 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_UI_VIEWS_MENU_LAYOUT_H_
+#define ATOM_BROWSER_UI_VIEWS_MENU_LAYOUT_H_
+
+#include "ui/views/layout/fill_layout.h"
+
+namespace atom {
+
+class MenuLayout : public views::FillLayout {
+ public:
+  explicit MenuLayout(int menu_height);
+  virtual ~MenuLayout();
+
+  // views::LayoutManager:
+  virtual void Layout(views::View* host) OVERRIDE;
+  virtual gfx::Size GetPreferredSize(views::View* host) OVERRIDE;
+  virtual int GetPreferredHeightForWidth(views::View* host, int width) OVERRIDE;
+
+ private:
+  bool HasMenu(const views::View* host) const;
+
+  int menu_height_;
+
+  DISALLOW_COPY_AND_ASSIGN(MenuLayout);
+};
+
+}  // namespace atom
+
+#endif  // ATOM_BROWSER_UI_VIEWS_MENU_LAYOUT_H_