[Offline pages] Adding in memory request queue store with tests

components/offline_pages/background/save_page_request.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_SAVE_PAGE_REQUEST_H_
 #define COMPONENTS_OFFLINE_PAGES_BACKGROUND_SAVE_PAGE_REQUEST_H_
 
 #include <stdint.h>
 
 #include "base/time/time.h"
@@ skipping 18 matching lines @@
 
   SavePageRequest(int64_t request_id,
                   const GURL& url,
                   const ClientId& client_id,
                   const base::Time& creation_time);
   SavePageRequest(int64_t request_id,
                   const GURL& url,
                   const ClientId& client_id,
                   const base::Time& creation_time,
                   const base::Time& activation_time);
+  SavePageRequest(const SavePageRequest& other);
   ~SavePageRequest();
 
   // Status of this request.
   Status GetStatus(const base::Time& now) const;
 
   // Updates the |last_attempt_time_| and increments |attempt_count_|.
   void MarkAttemptStarted(const base::Time& start_time);
 
   // Marks attempt as completed and clears |last_attempt_time_|.
   void MarkAttemptCompleted();
@@ skipping 32 matching lines @@
   // Number of attempts made to get the page.
   int attempt_count_;
 
   // Timestamp of the last request starting.
   base::Time last_attempt_time_;
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_BACKGROUND_SAVE_PAGE_REQUEST_H_