Add an API to Pause and Resume background offlining requests.

components/offline_pages/background/request_queue.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_H_
 #define COMPONENTS_OFFLINE_PAGES_BACKGROUND_REQUEST_QUEUE_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 65 matching lines @@
 
   // Removes the request matching the |request_id|. Result is returned through
   // |callback|.
   void RemoveRequest(int64_t request_id, const UpdateRequestCallback& callback);
 
   // Removes the requests matching the |client_ids|. Results are returned
   // through |callback|.
   void RemoveRequestsByClientId(const std::vector<ClientId>& client_id,
                                 const UpdateRequestCallback& callback);
 
+  // Pauses the requests matching the |request_ids|. Results are returned
+  // through |callback|.
+  void PauseRequests(const std::vector<int64_t>& request_ids,
+                               const UpdateRequestCallback& callback);
+
+  // Resumes the requests matching the |request_ids|. Results are returned
+  // through |callback|.
+  void ResumeRequests(const std::vector<int64_t>& request_ids,
+                                const UpdateRequestCallback& callback);
+
   void GetForUpdateDone(
       const RequestQueue::UpdateRequestCallback& update_callback,
       const SavePageRequest& update_request,
       bool success,
       const std::vector<SavePageRequest>& requests);
 
  private:
   // Callback used by |PurgeRequests|.
   typedef base::Callback<void(UpdateRequestResult,
                               int /* removed requests count */)>
       PurgeRequestsCallback;
 
   // Purges the queue, removing the requests that are no longer relevant, e.g.
   // expired request. Result is returned through |callback| carries the number
   // of removed requests.
   void PurgeRequests(const PurgeRequestsCallback& callback);
 
   std::unique_ptr<RequestQueueStore> store_;
 
   // Allows us to pass a weak pointer to callbacks.
   base::WeakPtrFactory<RequestQueue> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RequestQueue);
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_BACKGROUND_REQUEST_QUEUE_H_