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

chrome/browser/history/history.h

Index: chrome/browser/history/history.h
diff --git a/chrome/browser/history/history.h b/chrome/browser/history/history.h
index 06008de5b56fe64332998bbf6b0c808bb42d5f33..33c56dcd27682d20a869c564793cb4fbf2d81c37 100644
--- a/chrome/browser/history/history.h
+++ b/chrome/browser/history/history.h
@@ -425,6 +425,13 @@ class HistoryService : public CancelableRequestProvider,
                         CancelableRequestConsumerBase* consumer,
                         DownloadCreateCallback* callback);
 
+  // Implemented by the caller of 'GetNextDownloadId' below.
+  typedef Callback1<int/*next_download_id*/>::Type DownloadNextIdCallback;
+
+  // Runs the callback with the next available download id.
+  Handle GetNextDownloadId(CancelableRequestConsumerBase* consumer,
+                           DownloadNextIdCallback* callback);
+
   // Implemented by the caller of 'QueryDownloads' below, and is called when the
   // history service has retrieved a list of all download state. The call
   typedef Callback1<std::vector<DownloadHistoryInfo>*>::Type