[Offline pages] Downloads UI: Adding bridge for issuing notifications

components/offline_pages/downloads/download_ui_item.cc

 // 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.
 
 #include "components/offline_pages/downloads/download_ui_item.h"
 
 namespace offline_pages {
 
 DownloadUIItem::DownloadUIItem()
     : total_bytes(0) {
 }
 
 DownloadUIItem::DownloadUIItem(const OfflinePageItem& page)
     : guid(page.client_id.id),
       url(page.url),
       target_path(page.file_path),
       start_time(page.creation_time),
       total_bytes(page.file_size) {}
 
+DownloadUIItem::DownloadUIItem(const DownloadUIItem& other)
+    : guid(other.guid),
+      url(other.url),
+      target_path(other.target_path),
+      start_time(other.start_time),
+      total_bytes(other.total_bytes) {}
+
 DownloadUIItem::~DownloadUIItem() {
 }
 
 }  // namespace offline_pages