Make GetDismissedSuggestionsForDebugging asynchronous

components/ntp_snippets/offline_pages/offline_page_suggestions_provider.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_SNIPPETS_OFFLINE_PAGES_OFFLINE_PAGE_SUGGESTIONS_PROVIDER_H_
 #define COMPONENTS_NTP_SNIPPETS_OFFLINE_PAGES_OFFLINE_PAGE_SUGGESTIONS_PROVIDER_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 37 matching lines @@
 
  private:
   // ContentSuggestionsProvider implementation.
   std::vector<Category> GetProvidedCategories() override;
   CategoryStatus GetCategoryStatus(Category category) override;
   CategoryInfo GetCategoryInfo(Category category) override;
   void DismissSuggestion(const std::string& suggestion_id) override;
   void FetchSuggestionImage(const std::string& suggestion_id,
                             const ImageFetchedCallback& callback) override;
   void ClearCachedSuggestionsForDebugging(Category category) override;
-  std::vector<ContentSuggestion> GetDismissedSuggestionsForDebugging(
-      Category category) override;
+  void GetDismissedSuggestionsForDebugging(
+      Category category,
+      const DismissedSuggestionsCallback& callback) override;
   void ClearDismissedSuggestionsForDebugging(Category category) override;
 
   // OfflinePageModel::Observer implementation.
   void OfflinePageModelLoaded(offline_pages::OfflinePageModel* model) override;
   void OfflinePageModelChanged(offline_pages::OfflinePageModel* model) override;
   void OfflinePageDeleted(int64_t offline_id,
                           const offline_pages::ClientId& client_id) override;
 
   // Queries the OfflinePageModel for offline pages.
   void FetchOfflinePages();
 
   // Callback from the OfflinePageModel.
   void OnOfflinePagesLoaded(
       const offline_pages::MultipleOfflinePageItemResult& result);
+  void OnOfflinePagesLoadedForDismissedDebugging(
+      Category category,
+      const DismissedSuggestionsCallback& callback,
+      const offline_pages::MultipleOfflinePageItemResult& result);
 
   // Updates the |category_status_| of the |category| and notifies the
   // |observer_|, if necessary.
   void NotifyStatusChanged(Category category, CategoryStatus new_status);
 
   // Converts an OfflinePageItem to a ContentSuggestion for the |category|.
   ContentSuggestion ConvertOfflinePage(
       Category category,
       const offline_pages::OfflinePageItem& offline_page) const;
 
@@ skipping 34 matching lines @@
   // Whether the Download Manager UI is enabled, in which case the More button
   // for the Downloads section can redirect there.
   const bool download_manager_ui_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(OfflinePageSuggestionsProvider);
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_OFFLINE_PAGES_OFFLINE_PAGE_SUGGESTIONS_PROVIDER_H_