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

chrome/browser/ui/webui/demo_ui/demo_ui.cc

Index: chrome/browser/ui/webui/demo_ui/demo_ui.cc
diff --git a/chrome/browser/ui/webui/demo_ui/demo_ui.cc b/chrome/browser/ui/webui/demo_ui/demo_ui.cc
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+++ b/chrome/browser/ui/webui/demo_ui/demo_ui.cc
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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.
+
+#include "chrome/browser/ui/webui/demo_ui/demo.h"
+#include "chrome/browser/ui/webui/demo_ui/demo_ui.h"
+#include "chrome/browser/ui/webui/demo_ui/events/events_demo.h"
+#include "chrome/browser/ui/webui/demo_ui/reuse/reuse_demo.h"
+#include "chrome/browser/ui/webui/demo_ui/strings/strings_demo.h"
+#include "chrome/common/url_constants.h"
+#include "components/demo_ui/demo_web_ui_view.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_ui_data_source.h"
+#include "grit/browser_resources.h"
+
+namespace {
+
+void RegisterViewModels() {
+  Demo::Register();
+  EventsDemo::Register();
+  StringsDemo::Register();
+  ReuseDemo::Register();
+}
+
+void SetUpDataSource(content::WebUIDataSource* source) {
+  source->SetJsonPath("strings.js");
+  source->AddResourcePath("", IDR_DEMO_UI_HTML);
+  source->AddResourcePath("demo-element.html", IDR_DEMO_UI_DEMO_ELEMENT_HTML);
+  source->AddResourcePath("demo-element.js", IDR_DEMO_UI_DEMO_ELEMENT_JS);
+  source->AddResourcePath("events/events-demo.html",
+                          IDR_DEMO_UI_EVENTS_EVENTS_DEMO_HTML);
+  source->AddResourcePath("reuse/reuse-demo.html",
+                          IDR_DEMO_UI_REUSE_REUSE_DEMO_HTML);
+  source->AddResourcePath("strings/strings-demo.html",
+                          IDR_DEMO_UI_STRINGS_STRINGS_DEMO_HTML);
+}
+
+}  // namespace
+
+DemoUI::DemoUI(content::WebUI* web_ui) : WebUIController(web_ui) {
+  content::WebUIDataSource* source =
+      content::WebUIDataSource::Create(chrome::kChromeUIDemoHost);
+  SetUpDataSource(source);
+
+  RegisterViewModels();
+  view_.reset(new gen::DemoWebUIView(web_ui));
+  view_->Init();
+  view_->SetUpDataSource(source);
+
+  content::WebUIDataSource::Add(web_ui->GetWebContents()->GetBrowserContext(),
+                                source);
+}
+
+DemoUI::~DemoUI() {
+}