Download shelf autohides on showing in shell, just same as regular open

chrome/browser/download/download_item_model.h

Index: chrome/browser/download/download_item_model.h
diff --git a/chrome/browser/download/download_item_model.h b/chrome/browser/download/download_item_model.h
index 5fe5751dc8fa5269eb7e6f8e60db473ddd086909..c374ba19cd516be85e88f27b4ba8d0da475ffceb 100644
--- a/chrome/browser/download/download_item_model.h
+++ b/chrome/browser/download/download_item_model.h
@@ -165,6 +165,14 @@ class DownloadItemModel {
   // Set whether the download is being revived.
   void SetIsBeingRevived(bool is_being_revived);
 
+  // Returns |true| if user opened or shown download item in shell. Download
+  // shelf checks this for autohide.
+  bool GetOpenedOrShown() const;
+
+  // Sets whether download was opened or shown in shell. Download shelf marks
+  // downloads as shown or opened if user manually closes the shelf.
+  void SetOpenedOrShown(bool opened_or_shown);
+
   content::DownloadItem* download() { return download_; }
 
   // Returns a string representations of the current download progress sizes. If