[remote suggestions] Attach the fetch time to RemoteSnippets, ContentSnippets and SnippetArticle

components/ntp_snippets/remote/remote_suggestions_fetcher.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_REMOTE_REMOTE_SUGGESTIONS_FETCHER_H_
 #define COMPONENTS_NTP_SNIPPETS_REMOTE_REMOTE_SUGGESTIONS_FETCHER_H_
 
 #include <memory>
 #include <queue>
 #include <string>
@@ skipping 140 matching lines @@
                        SnippetsAvailableCallback callback,
                        std::unique_ptr<base::Value> result,
                        internal::FetchResult status_code,
                        const std::string& error_details);
   void FetchFinished(OptionalFetchedCategories categories,
                      SnippetsAvailableCallback callback,
                      internal::FetchResult status_code,
                      const std::string& error_details);
 
   bool JsonToSnippets(const base::Value& parsed,
-                      FetchedCategoriesVector* categories);
+                      FetchedCategoriesVector* categories,
+                      const base::Time& fetch_time);
 
   bool DemandQuotaForRequest(bool interactive_request);
 
   // Authentication for signed-in users.
   SigninManagerBase* signin_manager_;
   OAuth2TokenService* token_service_;
   std::unique_ptr<OAuth2TokenService::Request> oauth_request_;
   bool waiting_for_refresh_token_ = false;
 
   // When a token request gets canceled, we want to retry once.
@@ skipping 36 matching lines @@
   std::string last_fetch_json_;
 
   base::WeakPtrFactory<RemoteSuggestionsFetcher> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteSuggestionsFetcher);
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_REMOTE_REMOTE_SUGGESTIONS_FETCHER_H_