Implement DOM UI version of keyboard overlay.

chrome/browser/chromeos/dom_ui/keyboard_overlay_ui.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_CHROMEOS_DOM_UI_KEYBOARD_OVERLAY_UI_H_
+#define CHROME_BROWSER_CHROMEOS_DOM_UI_KEYBOARD_OVERLAY_UI_H_
+#pragma once
+
+#include <string>
+
+#include "chrome/browser/dom_ui/html_dialog_ui.h"
+
+class Browser;
+class Profile;
+
+class KeyboardOverlayUI : public HtmlDialogUI {
+ public:
+  explicit KeyboardOverlayUI(TabContents* contents);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(KeyboardOverlayUI);
+};
+
+#endif  // CHROME_BROWSER_CHROMEOS_DOM_UI_KEYBOARD_OVERLAY_UI_H_