Add more features to ntp-tiles-internal

components/ntp_tiles/webui/ntp_tiles_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_NTP_TILES_INTERNALS_MESSAGE_HANDLER_H_
 #define COMPONENTS_NTP_TILES_WEBUI_NTP_TILES_INTERNALS_MESSAGE_HANDLER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/optional.h"
 #include "components/ntp_tiles/most_visited_sites.h"
 
 namespace base {
 class ListValue;
 }  // namespace base
 
 namespace ntp_tiles {
 
 class MostVisitedSites;
 class NTPTilesInternalsMessageHandlerClient;
 
 // Implements the WebUI message handler for chrome://ntp-tiles-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 NTPTilesInternalsMessageHandler : public MostVisitedSites::Observer {
  public:
   NTPTilesInternalsMessageHandler();
   ~NTPTilesInternalsMessageHandler() override;
 
   // Called when the WebUI page's JavaScript has loaded and it is ready to
   // receive RegisterMessageCallback() calls. |client| must outlive this object.
   void RegisterMessages(NTPTilesInternalsMessageHandlerClient* client);
 
  private:
   // Callbacks registered in RegisterMessages().
   void HandleRegisterForEvents(const base::ListValue* args);
   void HandleUpdate(const base::ListValue* args);
+  void HandleFetchSuggestions(const base::ListValue* args);
+  void HandleViewPopularSitesJson(const base::ListValue* args);
 
   void SendSourceInfo();
   void SendTiles(const NTPTilesVector& tiles);
 
   // MostVisitedSites::Observer.
   void OnMostVisitedURLsAvailable(const NTPTilesVector& tiles) override;
   void OnIconMadeAvailable(const GURL& site_url) override;
 
   // Bridge to embedder's API.
   NTPTilesInternalsMessageHandlerClient* client_;
 
   int site_count_;
   std::unique_ptr<MostVisitedSites> most_visited_sites_;
 
+  std::string suggestions_status_;
+  std::string popular_sites_json_;
+
+  base::WeakPtrFactory<NTPTilesInternalsMessageHandler> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(NTPTilesInternalsMessageHandler);
 };
 
 }  // namespace ntp_tiles
 
 #endif  // COMPONENTS_NTP_TILES_WEBUI_NTP_TILES_INTERNALS_MESSAGE_HANDLER_H_