Add a Physical Web WebUI

ios/chrome/browser/ui/webui/physical_web_ui.h

+// Copyright 2016 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 IOS_CHROME_BROWSER_UI_WEBUI_PHYSICAL_WEB_UI_H_
+#define IOS_CHROME_BROWSER_UI_WEBUI_PHYSICAL_WEB_UI_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "ios/web/public/webui/web_ui_ios_controller.h"
+
+// The WebUI handler for chrome://physical-web.
+class PhysicalWebUI : public web::WebUIIOSController {
+ public:
+  explicit PhysicalWebUI(web::WebUIIOS* web_ui);
+  ~PhysicalWebUI() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PhysicalWebUI);
+};
+
+#endif  // IOS_CHROME_BROWSER_UI_WEBUI_PHYSICAL_WEB_UI_H_