Preliminary work on resuming downloads whose connections have expired.

chrome/browser/download/download_manager.h

Index: chrome/browser/download/download_manager.h
diff --git a/chrome/browser/download/download_manager.h b/chrome/browser/download/download_manager.h
index f4dc78d7ae13626d22bb5bd4c98a9d99d97c530f..cc9b149387601045b52ec6c3357636c2220730b1 100644
--- a/chrome/browser/download/download_manager.h
+++ b/chrome/browser/download/download_manager.h
@@ -110,11 +110,14 @@ class DownloadManager
   // Notifications sent from the download thread to the UI thread
   void StartDownload(DownloadCreateInfo* info);
   void UpdateDownload(int32 download_id, int64 size);
+  void OnResponseCompleted(int32 download_id, int64 size, int os_error);
   void OnAllDataSaved(int32 download_id, int64 size);
+  void DownloadError(int32 download_id, int64 size, int os_error);
 
   // Called from a view when a user clicks a UI button or link.
   void DownloadCancelled(int32 download_id);
   void PauseDownload(int32 download_id, bool pause);
+  void RestartDownload(int32 download_id);
   void RemoveDownload(int64 download_handle);
 
   // Called when the download is renamed to its final name.
@@ -276,6 +279,13 @@ class DownloadManager
                             int request_id,
                             bool pause);
 
+  // Makes the ResourceDispatcherHost restart a download request.
+  // Called on the IO thread.
+  void RestartDownloadRequest(ResourceDispatcherHost* rdh,
+                              int render_process_id,
+                              int request_id,
+                              DownloadCreateInfo* info);
+
   // Inform observers that the model has changed.
   void NotifyModelChanged();