Add window manager component.

wm/foreign_window_widget.h

Index: wm/foreign_window_widget.h
diff --git a/wm/foreign_window_widget.h b/wm/foreign_window_widget.h
new file mode 100644
index 0000000000000000000000000000000000000000..00b53233a9dc9dbb13ca69cd4c0293459ce89dbd
--- /dev/null
+++ b/wm/foreign_window_widget.h
@@ -0,0 +1,30 @@
+// Copyright (c) 2013 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 WM_FOREIGN_WINDOW_WIDGET_H_
+#define WM_FOREIGN_WINDOW_WIDGET_H_
+
+#include "ui/views/widget/widget.h"
+
+namespace wm {
+class ForeignWindow;
+
+class ForeignWindowWidget : public views::Widget {
+ public:
+  static views::Widget* CreateWindow(ForeignWindow* foreign_window);
+
+  virtual void Close() OVERRIDE;
+
+ private:
+  explicit ForeignWindowWidget(ForeignWindow* foreign_window);
+  virtual ~ForeignWindowWidget();
+
+  scoped_refptr<ForeignWindow> foreign_window_;
+
+  DISALLOW_COPY_AND_ASSIGN(ForeignWindowWidget);
+};
+
+}  // namespace wm
+
+#endif  // WM_FOREIGN_WINDOW_WIDGET_H_