[Offline pages] Adding capability to query a subset of requests based on IDs

components/offline_pages/background/request_queue_store_sql.h

Index: components/offline_pages/background/request_queue_store_sql.h
diff --git a/components/offline_pages/background/request_queue_store_sql.h b/components/offline_pages/background/request_queue_store_sql.h
index d67d14f348be14319b20eb265341159b9cff3466..0be2eb5700e73b3a2ab7100ed6480ff13da13ec5 100644
--- a/components/offline_pages/background/request_queue_store_sql.h
+++ b/components/offline_pages/background/request_queue_store_sql.h
@@ -33,6 +33,11 @@ class RequestQueueStoreSQL : public RequestQueueStore {
 
   // RequestQueueStore implementation.
   void GetRequests(const GetRequestsCallback& callback) override;
+  // Note: current implementation of this method makes a SQL query per ID. This
+  // is OK as long as number of IDs stays low, which is a typical case.
+  // Implementation should be revisited in case that presumption changes.
+  void GetRequestsByIds(const std::vector<int64_t>& request_ids,
+                        const UpdateCallback& callback) override;
   void AddRequest(const SavePageRequest& offline_page,
                   const AddCallback& callback) override;
   void UpdateRequests(const std::vector<SavePageRequest>& requests,