Add chrome://popular-sites-internals/ to iOS.

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

Index: ios/chrome/browser/ui/webui/popular_sites_internals_ui.h
diff --git a/ios/chrome/browser/ui/webui/popular_sites_internals_ui.h b/ios/chrome/browser/ui/webui/popular_sites_internals_ui.h
new file mode 100644
index 0000000000000000000000000000000000000000..a36f295e7d2dd885069d72042e5ef234f04a7848
--- /dev/null
+++ b/ios/chrome/browser/ui/webui/popular_sites_internals_ui.h
@@ -0,0 +1,23 @@
+// 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_POPULAR_SITES_INTERNALS_UI_H_
+#define IOS_CHROME_BROWSER_UI_WEBUI_POPULAR_SITES_INTERNALS_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 PopularSitesInternalsUI : public web::WebUIIOSController {
+ public:
+  explicit PopularSitesInternalsUI(web::WebUIIOS* web_ui);
+  ~PopularSitesInternalsUI() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PopularSitesInternalsUI);
+};
+
+#endif  // IOS_CHROME_BROWSER_UI_WEBUI_POPULAR_SITES_INTERNALS_UI_H_