Shift "commit point" for when a download will no longer accept cancels.

net/base/net_log_event_type_list.h

Index: net/base/net_log_event_type_list.h
diff --git a/net/base/net_log_event_type_list.h b/net/base/net_log_event_type_list.h
index 755407a1976cdac8b9b2985104ed5cdffabc4c04..8fea0d50479946c4e4907c3f838a528d74832925 100644
--- a/net/base/net_log_event_type_list.h
+++ b/net/base/net_log_event_type_list.h
@@ -1584,11 +1584,17 @@ EVENT_TYPE(DOWNLOAD_ITEM_INTERRUPTED)
 //   }
 EVENT_TYPE(DOWNLOAD_ITEM_RESUMED)
 
-// This event is created when a download item is finished.
+// This event is created when a download item is completing.
 //   {
 //     "bytes_so_far": <Number of bytes received>,
 //     "final_hash": <Final hash, as a hex-encoded binary string>,
 //   }
+EVENT_TYPE(DOWNLOAD_ITEM_COMPLETING)
+
+// This event is created when a download item is finished.
+//   {
+//     "auto_opened": <Whether or not the download was auto-opened>
+//   }
 EVENT_TYPE(DOWNLOAD_ITEM_FINISHED)
 
 // This event is created when a download item is canceled.