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

chrome/browser/ui/webui/popular_sites_internals_message_handler.h

 // Copyright 2015 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_POPULAR_SITES_INTERNALS_MESSAGE_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_POPULAR_SITES_INTERNALS_MESSAGE_HANDLER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
-#include "base/memory/weak_ptr.h"
+#include "components/ntp_tiles/webui/popular_sites_internals_message_handler_impl.h"
 #include "content/public/browser/web_ui_message_handler.h"
 
-namespace base {
-class ListValue;
-}  // namespace base
-
-namespace ntp_tiles {
-class PopularSites;
-}  // namespace ntp_tiles
-
 // The implementation for the chrome://popular-sites-internals page.
 class PopularSitesInternalsMessageHandler

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

Nit: At the risk of embiggening the class name even more, a common pattern is to
call the chrome/ embedder implementation of a client Chrome...Client.

-    : public content::WebUIMessageHandler {
+    : public content::WebUIMessageHandler,
+      public ntp_tiles::PopularSitesInternalsMessageHandlerClient {
  public:
   PopularSitesInternalsMessageHandler();
   ~PopularSitesInternalsMessageHandler() override;
 
  private:
   // content::WebUIMessageHandler:
   void RegisterMessages() override;
 
-  void HandleRegisterForEvents(const base::ListValue* args);
-  void HandleUpdate(const base::ListValue* args);
-  void HandleViewJson(const base::ListValue* args);
+  // PopularSitesInternalsMessageHandlerClient
+  base::SequencedWorkerPool* GetBlockingPool() override;
+  std::unique_ptr<ntp_tiles::PopularSites> MakePopularSites() override;
+  PrefService* GetPrefs() override;
+  void RegisterMessageCallback(
+      const std::string& message,
+      const base::Callback<void(const base::ListValue*)>& callback) override;
+  void CallJavascriptFunctionVector(
+      const std::string& name,
+      const std::vector<const base::Value*>& values) override;
 
-  void SendOverrides();
-  void SendDownloadResult(bool success);
-  void SendSites();
-  void SendJson(const std::string& json);
-
-  void OnPopularSitesAvailable(bool explicit_request, bool success);
-
-  std::unique_ptr<ntp_tiles::PopularSites> popular_sites_;
-
-  base::WeakPtrFactory<PopularSitesInternalsMessageHandler> weak_ptr_factory_;
+  ntp_tiles::PopularSitesInternalsMessageHandlerImpl impl_;
 
   DISALLOW_COPY_AND_ASSIGN(PopularSitesInternalsMessageHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_POPULAR_SITES_INTERNALS_MESSAGE_HANDLER_H_