RemoteContentSuggestions: Stores the time of the last successful background fetch in a pref

components/ntp_snippets/remote/ntp_snippets_fetcher.h

Index: components/ntp_snippets/remote/ntp_snippets_fetcher.h
diff --git a/components/ntp_snippets/remote/ntp_snippets_fetcher.h b/components/ntp_snippets/remote/ntp_snippets_fetcher.h
index 62437c99096287262a34c2022b1411af6ca86f7f..772aa0599b2b9389d58102bb989494c03330847a 100644
--- a/components/ntp_snippets/remote/ntp_snippets_fetcher.h
+++ b/components/ntp_snippets/remote/ntp_snippets_fetcher.h
@@ -80,12 +80,6 @@ class NTPSnippetsFetcher : public OAuth2TokenService::Consumer,
   using FetchedCategoriesVector = std::vector<FetchedCategory>;
   using OptionalFetchedCategories = base::Optional<FetchedCategoriesVector>;
 
-  // |snippets| contains parsed snippets if a fetch succeeded. If problems
-  // occur, |snippets| contains no value (no actual vector in base::Optional).
-  // Error details can be retrieved using last_status().
-  using SnippetsAvailableCallback =
-      base::OnceCallback<void(OptionalFetchedCategories fetched_categories)>;
-
   // Enumeration listing all possible outcomes for fetch attempts. Used for UMA
   // histograms, so do not change existing values. Insert new values at the end,
   // and update the histogram definition.
@@ -102,6 +96,13 @@ class NTPSnippetsFetcher : public OAuth2TokenService::Consumer,
     RESULT_MAX
   };
 
+  // |snippets| contains parsed snippets if a fetch succeeded. If problems
+  // occur, |snippets| contains no value (no actual vector in base::Optional).
+  // Error details can be retrieved using last_status().
+  using SnippetsAvailableCallback =
+      base::OnceCallback<void(FetchResult fetch_result,
+                              OptionalFetchedCategories fetched_categories)>;
+
   // Enumeration listing all possible variants of dealing with personalization.
   enum class Personalization { kPersonal, kNonPersonal, kBoth };