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

components/ntp_snippets/remote/json_request.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_JSON_REQUEST_H_
 #define COMPONENTS_NTP_SNIPPETS_REMOTE_JSON_REQUEST_H_
 
 #include <memory>
 #include <string>
 #include <utility>
 
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "base/optional.h"
+#include "base/time/time.h"
 #include "components/ntp_snippets/remote/request_params.h"
 #include "components/ntp_snippets/status.h"
 #include "components/translate/core/browser/language_model.h"
 #include "google_apis/gaia/oauth2_token_service.h"
 #include "net/http/http_request_headers.h"
 
 namespace base {
 class Value;
-class TickClock;
+class Clock;
 }  // namespace base
 
 class FetchAPI;
 
 namespace ntp_snippets {
 class UserClassifier;
 
 namespace internal {
 
 // Enumeration listing all possible outcomes for fetch attempts. Used for UMA
@@ skipping 40 matching lines @@
 
     Builder& SetAuthentication(const std::string& account_id,
                                const std::string& auth_header);
     Builder& SetCreationTime(base::TimeTicks creation_time);
     Builder& SetFetchAPI(FetchAPI fetch_api);
     // The language_model borrowed from the fetcher needs to stay alive until
     // the request body is built.
     Builder& SetLanguageModel(const translate::LanguageModel* language_model);
     Builder& SetParams(const RequestParams& params);
     Builder& SetParseJsonCallback(ParseJSONCallback callback);
-    // The tick_clock borrowed from the fetcher will be injected into the
+    // The clock borrowed from the fetcher will be injected into the
     // request. It will be used at build time and after the fetch returned.
     // It has to be alive until the request is destroyed.
-    Builder& SetTickClock(base::TickClock* tick_clock);
+    Builder& SetClock(base::Clock* clock);
     Builder& SetUrl(const GURL& url);
     Builder& SetUrlRequestContextGetter(
         const scoped_refptr<net::URLRequestContextGetter>& context_getter);
     Builder& SetUserClassifier(const UserClassifier& user_classifier);
 
     // These preview methods allow to inspect the Request without exposing it
     // publicly.
     // TODO(fhorschig): Remove these when moving the Builder to
     // snippets::internal and trigger the request to intercept the request.
     std::string PreviewRequestBodyForTesting() { return BuildBody(); }
@@ skipping 10 matching lines @@
         net::URLFetcherDelegate* request,
         const std::string& headers,
         const std::string& body) const;
 
     void PrepareLanguages(
         translate::LanguageModel::LanguageInfo* ui_language,
         translate::LanguageModel::LanguageInfo* other_top_language) const;
 
     // Only required, if the request needs to be sent.
     std::string auth_header_;
-    base::TickClock* tick_clock_;
+    base::Clock* clock_;
     FetchAPI fetch_api_;
     RequestParams params_;
     ParseJSONCallback parse_json_callback_;
     GURL url_;
     scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
 
     // Optional properties.
     std::string obfuscated_gaia_id_;
     std::string user_class_;
     const translate::LanguageModel* language_model_;
 
     DISALLOW_COPY_AND_ASSIGN(Builder);
   };
 
   JsonRequest(base::Optional<Category> exclusive_category,
-              base::TickClock* tick_clock,
+              base::Clock* clock,
               const ParseJSONCallback& callback);
   JsonRequest(JsonRequest&&);
   ~JsonRequest() override;
 
   void Start(CompletedCallback callback);
 
   const base::Optional<Category>& exclusive_category() const {
     return exclusive_category_;
   }
 
   base::TimeDelta GetFetchDuration() const;
   std::string GetResponseString() const;
 
  private:
   // URLFetcherDelegate implementation.
   void OnURLFetchComplete(const net::URLFetcher* source) override;
 
   void ParseJsonResponse();
   void OnJsonParsed(std::unique_ptr<base::Value> result);
   void OnJsonError(const std::string& error);
 
   // The fetcher for downloading the snippets. Only non-null if a fetch is
   // currently ongoing.
   std::unique_ptr<net::URLFetcher> url_fetcher_;
 
   // If set, only return results for this category.
   base::Optional<Category> exclusive_category_;
 
-  // Use the TickClock from the Fetcher to measure the fetch time. It will be
+  // Use the Clock from the Fetcher to measure the fetch time. It will be
   // used on creation and after the fetch returned. It has to be alive until the
   // request is destroyed.
-  base::TickClock* tick_clock_;
-  base::TimeTicks creation_time_;
+  base::Clock* clock_;
+  base::Time creation_time_;
 
   // This callback is called to parse a json string. It contains callbacks for
   // error and success cases.
   ParseJSONCallback parse_json_callback_;
 
   // The callback to notify when URLFetcher finished and results are available.
   CompletedCallback request_completed_callback_;
 
   base::WeakPtrFactory<JsonRequest> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(JsonRequest);
 };
 
 }  // namespace internal
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_REMOTE_JSON_REQUEST_H_