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

components/ntp_tiles/webui/popular_sites_internals_message_handler.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 COMPONENTS_NTP_TILES_WEBUI_POPULAR_SITES_HANDLER_H_
+#define COMPONENTS_NTP_TILES_WEBUI_POPULAR_SITES_HANDLER_H_
+
+#include <memory>
+#include <string>
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+
+namespace base {
+class ListValue;
+}  // namespace base
+
+namespace ntp_tiles {
+
+class PopularSites;
+class PopularSitesInternalsMessageHandlerClient;
+
+// Implements the WebUI message handler for chrome://popular-sites-internals/
+//
+// Because content and iOS use different implementations of WebUI, this class
+// implements the generic portion and depends on the embedder to inject a bridge
+// to the embedder's API. It cannot itself implement either API directly.
+class PopularSitesInternalsMessageHandler {
+ public:
+  explicit PopularSitesInternalsMessageHandler(
+      PopularSitesInternalsMessageHandlerClient* web_ui);
+  ~PopularSitesInternalsMessageHandler();
+
+  // Called when the WebUI page's JavaScript has loaded and it is ready to
+  // receive RegisterMessageCallback() calls.
+  void RegisterMessages();
+
+ private:
+  // Callbacks registered in RegisterMessages().
+  void HandleRegisterForEvents(const base::ListValue* args);
+  void HandleUpdate(const base::ListValue* args);
+  void HandleViewJson(const base::ListValue* args);
+
+  void SendOverrides();
+  void SendDownloadResult(bool success);
+  void SendSites();
+  void SendJson(const std::string& json);
+
+  // Completion handler for popular_sites_->StartFetch().
+  void OnPopularSitesAvailable(bool explicit_request, bool success);
+
+  // Bridge to embedder's API.
+  PopularSitesInternalsMessageHandlerClient* web_ui_;
+
+  std::unique_ptr<PopularSites> popular_sites_;
+
+  base::WeakPtrFactory<PopularSitesInternalsMessageHandler> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(PopularSitesInternalsMessageHandler);
+};
+
+}  // namespace ntp_tiles
+
+#endif  // COMPONENTS_NTP_TILES_WEBUI_POPULAR_SITES_HANDLER_H_