Add chrome://slow for enabling performance tracing for feedback reports.

chrome/browser/ui/webui/chromeos/slow_ui.h

+// 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 CHROME_BROWSER_UI_WEBUI_CHROMEOS_SLOW_UI_H_
+#define CHROME_BROWSER_UI_WEBUI_CHROMEOS_SLOW_UI_H_
+
+#include "content/public/browser/web_ui_controller.h"
+
+namespace chromeos {
+
+// A custom WebUI that allows users to enable and disable performance tracing
+// for feedback reports.
+class SlowUI : public content::WebUIController {
+ public:
+  explicit SlowUI(content::WebUI* web_ui);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SlowUI);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_SLOW_UI_H_
+