sql::MetaTable.next_download_id, DownloadManager::GetNextId()

chrome/browser/history/history_marshaling.h

 // Copyright (c) 2011 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.
 
 // Data structures for communication between the history service on the main
 // thread and the backend on the history thread.
 
 #ifndef CHROME_BROWSER_HISTORY_HISTORY_MARSHALING_H_
 #define CHROME_BROWSER_HISTORY_HISTORY_MARSHALING_H_
 #pragma once
@@ skipping 37 matching lines @@
 typedef CancelableRequest<HistoryService::ThumbnailDataCallback>
     GetPageThumbnailRequest;
 
 // Favicons -------------------------------------------------------------------
 
 typedef CancelableRequest<FaviconService::FaviconDataCallback>
     GetFaviconRequest;
 
 // Downloads ------------------------------------------------------------------
 
+typedef CancelableRequest1<HistoryService::DownloadNextIdCallback,
+                           int/*next_id*/>
+    DownloadNextIdRequest;
+
+
 typedef CancelableRequest1<HistoryService::DownloadQueryCallback,
                            std::vector<DownloadHistoryInfo> >
     DownloadQueryRequest;
 
 typedef CancelableRequest<HistoryService::DownloadCreateCallback>
     DownloadCreateRequest;
 
 // Deletion --------------------------------------------------------------------
 
 typedef CancelableRequest<HistoryService::ExpireHistoryCallback>
@@ skipping 17 matching lines @@
 // The argument here is an input value, which is the task to run on the
 // background thread. The callback is used to execute the portion of the task
 // that executes on the main thread.
 typedef CancelableRequest1<HistoryService::HistoryDBTaskCallback,
                            scoped_refptr<HistoryDBTask> >
     HistoryDBTaskRequest;
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_MARSHALING_H_