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

components/ntp_tiles/webui/popular_sites_internals_message_handler_impl.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 <vector>
+
+#include "base/callback_forward.h"
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+
+class PrefService;
+
+namespace base {
+class Value;
+class ListValue;
+class SequencedWorkerPool;
+}  // namespace base
+
+namespace ntp_tiles {
+
+class PopularSites;
+
+class PopularSitesInternalsMessageHandlerClient {

[Bernhard Bauer, 2016/10/28 16:56:38]

Move this to a separate file?

+ public:
+  // Returns the blocking pool for hte embedder.
+  virtual base::SequencedWorkerPool* GetBlockingPool() = 0;
+
+  // Returns the PrefService for the embedder and containing WebUI page.
+  virtual PrefService* GetPrefs() = 0;
+
+  // Creates a new PopularSites based on the context pf the WebUI page.
+  virtual std::unique_ptr<ntp_tiles::PopularSites> MakePopularSites() = 0;
+
+  // Registers a callback in Javascript. See content::WebUI and web::WebUIIOS.
+  virtual void RegisterMessageCallback(
+      const std::string& message,
+      const base::Callback<void(const base::ListValue*)>& callback) = 0;
+
+  // Invokes a function in Javascript. See content::WebUI and web::WebUIIOS.
+  virtual void CallJavascriptFunctionVector(
+      const std::string& name,
+      const std::vector<const base::Value*>& values) = 0;
+
+  // Helper function for CallJavascriptFunctionVector().
+  template <typename... Arg>
+  void CallJavascriptFunction(const std::string& name, const Arg&... arg) {
+    CallJavascriptFunctionVector(name, {&arg...});
+  }
+
+ protected:
+  PopularSitesInternalsMessageHandlerClient();
+  virtual ~PopularSitesInternalsMessageHandlerClient();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PopularSitesInternalsMessageHandlerClient);
+};
+
+class PopularSitesInternalsMessageHandlerImpl {
+ public:
+  PopularSitesInternalsMessageHandlerImpl(
+      PopularSitesInternalsMessageHandlerClient* web_ui);
+  ~PopularSitesInternalsMessageHandlerImpl();
+
+  // 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);
+
+  PopularSitesInternalsMessageHandlerClient* web_ui_;
+
+  std::unique_ptr<PopularSites> popular_sites_;
+
+  base::WeakPtrFactory<PopularSitesInternalsMessageHandlerImpl>
+      weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(PopularSitesInternalsMessageHandlerImpl);
+};
+
+}  // namespace ntp_tiles
+
+#endif  // COMPONENTS_NTP_TILES_WEBUI_POPULAR_SITES_HANDLER_H_