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

components/offline_pages/background/request_queue_store.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_OFFLINE_PAGES_BACKGROUND_REQUEST_QUEUE_STORE_H_
 #define COMPONENTS_OFFLINE_PAGES_BACKGROUND_REQUEST_QUEUE_STORE_H_
 
 #include <stdint.h>
 #include <vector>
 
@@ skipping 20 matching lines @@
       std::vector<std::unique_ptr<SavePageRequest>> /* requests */)>
       GetRequestsCallback;
   typedef base::Callback<void(ItemActionStatus)> AddCallback;
   typedef base::Callback<void(bool /* success */)> ResetCallback;
 
   virtual ~RequestQueueStore(){};
 
   // Gets all of the requests from the store.
   virtual void GetRequests(const GetRequestsCallback& callback) = 0;
 
+  // Gets requests with specified IDs from the store. UpdateCallback is used
+  // instead of GetRequestsCallback to indicate which requests where not found.
+  virtual void GetRequestsByIds(const std::vector<int64_t>& request_ids,
+                                const UpdateCallback& callback) = 0;
+
   // Asynchronously adds request in store. Fails if request with the same
   // offline ID already exists.
   virtual void AddRequest(const SavePageRequest& offline_page,
                           const AddCallback& callback) = 0;
 
   // Asynchronously updates requests in store.
   virtual void UpdateRequests(const std::vector<SavePageRequest>& requests,
                               const UpdateCallback& callback) = 0;
 
   // Asynchronously removes requests from the store using their IDs.
   // Result of the update, and a number of removed pages is passed in the
   // callback.
   // Result of remove should be false, when one of the provided items couldn't
   // be deleted, e.g. because it was missing.
   virtual void RemoveRequests(const std::vector<int64_t>& request_ids,
                               const UpdateCallback& callback) = 0;
 
   // Resets the store.
   virtual void Reset(const ResetCallback& callback) = 0;
 
   // Gets the store state.
   virtual StoreState state() const = 0;
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_BACKGROUND_REQUEST_QUEUE_STORE_H_