Cleanup Tool WebUI: Add HTML content and styling with dummy JS

chrome/browser/resources/cleanup_tool/toolbar.js

Index: chrome/browser/resources/cleanup_tool/toolbar.js
diff --git a/chrome/browser/resources/cleanup_tool/toolbar.js b/chrome/browser/resources/cleanup_tool/toolbar.js
new file mode 100644
index 0000000000000000000000000000000000000000..e12d720ed8db5eca2d001127142971fa9b047c3f
--- /dev/null
+++ b/chrome/browser/resources/cleanup_tool/toolbar.js
@@ -0,0 +1,11 @@
+// Copyright 2017 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.
+
+cr.define('cleanup', function() {
+  var Toolbar = Polymer({
+    is: 'cleanup-tool-toolbar',
+  });
+
+  return {Toolbar: Toolbar};
+});