Demo UI made with a help of WUG toolkit (DO NOT SEND TO CQ).

chrome/browser/ui/webui/demo_ui/demo_ui.h

Index: chrome/browser/ui/webui/demo_ui/demo_ui.h
diff --git a/chrome/browser/ui/webui/demo_ui/demo_ui.h b/chrome/browser/ui/webui/demo_ui/demo_ui.h
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+// Copyright 2014 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_UI_WEBUI_DEMO_UI_DEMO_UI_H_
+#define CHROME_BROWSER_UI_WEBUI_DEMO_UI_DEMO_UI_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/public/browser/web_ui_controller.h"
+
+namespace content {
+class WebUI;
+}
+
+namespace gen {
+class DemoWebUIView;
+}
+
+class DemoUI : public content::WebUIController {
+ public:
+  explicit DemoUI(content::WebUI* web_ui);
+  ~DemoUI() override;
+
+ private:
+  scoped_ptr<gen::DemoWebUIView> view_;
+
+  DISALLOW_COPY_AND_ASSIGN(DemoUI);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_DEMO_UI_DEMO_UI_H_