Preliminary work on resuming downloads whose connections have expired.

chrome/browser/download/download_file_manager.h

Index: chrome/browser/download/download_file_manager.h
diff --git a/chrome/browser/download/download_file_manager.h b/chrome/browser/download/download_file_manager.h
index 5ccf533743b2b8d437527818626943576df85980..00cb05e87e36763f792457a4c6866eb475c16507 100644
--- a/chrome/browser/download/download_file_manager.h
+++ b/chrome/browser/download/download_file_manager.h
@@ -74,6 +74,9 @@ class DownloadFileManager
   // Called on the IO thread
   int GetNextId();
 
+  // Return the ID that matches |url| and |path|, or -1 if not found.
+  int GetDownloadId(const GURL& url, const FilePath& path) const;
+
   // Called on UI thread to make DownloadFileManager start the download.
   void StartDownload(DownloadCreateInfo* info);
 
@@ -81,7 +84,10 @@ class DownloadFileManager
   // download thread.
   void UpdateDownload(int id, DownloadBuffer* buffer);
   void CancelDownload(int id);
-  void OnResponseCompleted(int id, DownloadBuffer* buffer);
+  void OnResponseCompleted(int id,
+                           DownloadBuffer* buffer,
+                           int os_error,
+                           const std::string& security_info);
 
   // Called on FILE thread by DownloadManager at the beginning of its shutdown.
   void OnDownloadManagerShutdown(DownloadManager* manager);