Create the download folder if it doesn't exist. That is, the actual download ...

chrome/browser/download/save_package.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_SAVE_PACKAGE_H_
 #define CHROME_BROWSER_DOWNLOAD_SAVE_PACKAGE_H_
 
 #include <queue>
 #include <string>
 #include <vector>
@@ skipping 112 matching lines @@
 
   // Accessor
   bool finished() { return finished_; }
   SavePackageType save_type() { return save_type_; }
 
   // Since for one tab, it can only have one SavePackage in same time.
   // Now we actually use render_process_id as tab's unique id.
   int tab_id() const { return tab_id_; }
 
   void GetSaveInfo();
+  void ContinueGetSaveInfo(FilePath save_dir);
   void ContinueSave(SavePackageParam* param,
                     const FilePath& final_name,
                     int index);
 
   // RenderViewHostDelegate::Save ----------------------------------------------
 
   // Process all of the current page's savable links of subresources, resources
   // referrers and frames (including the main frame and subframes) from the
   // render view host.
   virtual void OnReceivedSavableResourceLinksForCurrentPage(
@@ skipping 49 matching lines @@
 
   // SelectFileDialog::Listener interface.
   virtual void FileSelected(const FilePath& path, int index, void* params);
   virtual void FileSelectionCanceled(void* params);
 
  private:
   // For testing only.
   SavePackage(const FilePath& file_full_path,
               const FilePath& directory_full_path);
 
+  // Notes from Init() above applies here as well.
+  void InternalInit();
+
   void Stop();
   void CheckFinish();
   void SaveNextFile(bool process_all_remainder_items);
   void DoSavingProcess();
 
   // Create a file name based on the response from the server.
   bool GenerateFilename(const std::string& disposition,
                         const GURL& url,
                         bool need_html_ext,
                         FilePath::StringType* generated_name);
@@ skipping 96 matching lines @@
 
   // For managing select file dialogs.
   scoped_refptr<SelectFileDialog> select_file_dialog_;
 
   friend class SavePackageTest;
 
   DISALLOW_COPY_AND_ASSIGN(SavePackage);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_SAVE_PACKAGE_H_