[Background fetching] Background fetching when opening an NTP.

components/ntp_snippets/remote/scheduling_remote_suggestions_provider.h

Index: components/ntp_snippets/remote/scheduling_remote_suggestions_provider.h
diff --git a/components/ntp_snippets/remote/scheduling_remote_suggestions_provider.h b/components/ntp_snippets/remote/scheduling_remote_suggestions_provider.h
index 71dd4f8c487c1db86a7047cb25e4d82576a603d7..db3580cf0c2951552515e40929578002875a5b6c 100644
--- a/components/ntp_snippets/remote/scheduling_remote_suggestions_provider.h
+++ b/components/ntp_snippets/remote/scheduling_remote_suggestions_provider.h
@@ -114,20 +114,26 @@ class SchedulingRemoteSuggestionsProvider final
   // schedule.
   void StopScheduling();
 
+  // Checks whether it is time to perform a soft background fetch.
+  bool ShouldRefetchInTheBackgroundNow();
+
   // Callback after Fetch is completed.
   void FetchFinished(const FetchDoneCallback& callback,
-                     Status status_code,
+                     Status fetch_status,
                      std::vector<ContentSuggestion> suggestions);
 
+  // Callback after RefetchInTheBackground is completed.
+  void RefetchInTheBackgroundFinished(
+      std::unique_ptr<FetchStatusCallback> callback,
+      Status fetch_status);
+
   FetchingSchedule GetDesiredFetchingSchedule() const;
   FetchingSchedule GetLastFetchingSchedule() const;
   void StoreLastFetchingSchedule(const FetchingSchedule& schedule);
 
-  // Common function to call after each fetch.
-  void OnFetchCompleted(Status status);
-
   // Applies the provided |schedule|.
-  void ApplyFetchingSchedule(const FetchingSchedule& schedule);
+  void ApplyFetchingSchedule(const FetchingSchedule& schedule,
+                             bool also_apply_persistent_schedule);
 
   // Interface for doing all the actual work (apart from scheduling).
   std::unique_ptr<RemoteSuggestionsProvider> provider_;
@@ -136,6 +142,8 @@ class SchedulingRemoteSuggestionsProvider final
   // null.
   PersistentScheduler* persistent_scheduler_;
 
+  bool background_fetch_in_progress_;
+
   // Used to adapt the schedule based on usage activity of the user. Not owned.
   const UserClassifier* user_classifier_;