[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>
 #include <utility>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "base/optional.h"
+#include "base/time/clock.h"
 #include "base/time/tick_clock.h"
 #include "components/ntp_snippets/category.h"
 #include "components/ntp_snippets/category_info.h"
 #include "components/ntp_snippets/remote/json_request.h"
 #include "components/ntp_snippets/remote/remote_suggestion.h"
 #include "components/ntp_snippets/remote/request_params.h"
 #include "components/ntp_snippets/remote/request_throttler.h"
 #include "components/ntp_snippets/status.h"
 #include "components/translate/core/browser/language_model.h"
 #include "net/url_request/url_request_context_getter.h"
@@ skipping 71 matching lines @@
   // Debug string representing the status/result of the last fetch attempt.
   const std::string& last_status() const { return last_status_; }
 
   // Returns the last JSON fetched from the server.
   const std::string& last_json() const { return last_fetch_json_; }
 
   // Returns the URL endpoint used by the fetcher.
   const GURL& fetch_url() const { return fetch_url_; }
 
   // Overrides internal clock for testing purposes.
-  void SetTickClockForTesting(std::unique_ptr<base::TickClock> tick_clock) {
-    tick_clock_ = std::move(tick_clock);
+  void SetClockForTesting(std::unique_ptr<base::Clock> clock) {
+    clock_ = std::move(clock);
   }
 
  private:
   FRIEND_TEST_ALL_PREFIXES(ChromeReaderSnippetsFetcherTest,
                            BuildRequestAuthenticated);
   FRIEND_TEST_ALL_PREFIXES(ChromeReaderSnippetsFetcherTest,
                            BuildRequestUnauthenticated);
   FRIEND_TEST_ALL_PREFIXES(ChromeReaderSnippetsFetcherTest,
                            BuildRequestExcludedIds);
   FRIEND_TEST_ALL_PREFIXES(ChromeReaderSnippetsFetcherTest,
@@ skipping 31 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 13 matching lines @@
   const ParseJSONCallback parse_json_callback_;
 
   // API endpoint for fetching suggestions.
   const GURL fetch_url_;
   // Which API to use
   const internal::FetchAPI fetch_api_;
 
   // API key to use for non-authenticated requests.
   const std::string api_key_;
 
-  // Allow for an injectable tick clock for testing.
-  std::unique_ptr<base::TickClock> tick_clock_;
+  // Allow for an injectable clock for testing.
+  std::unique_ptr<base::Clock> clock_;
 
   // Classifier that tells us how active the user is. Not owned.
   const UserClassifier* user_classifier_;
 
   // Request throttlers for limiting requests for different classes of users.
   RequestThrottler request_throttler_rare_ntp_user_;
   RequestThrottler request_throttler_active_ntp_user_;
   RequestThrottler request_throttler_active_suggestions_consumer_;
 
   // Info on the last finished fetch.
   std::string last_status_;
   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_