Added a link to the downloads tab that opens the downloads folder.

chrome/browser/ui/webui/downloads_dom_handler.h

 // Copyright (c) 2011 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_UI_WEBUI_DOWNLOADS_DOM_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_DOWNLOADS_DOM_HANDLER_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 53 matching lines @@
   // Callback for the "remove" message - removes the file download from shelf
   // and list.
   void HandleRemove(const base::ListValue* args);
 
   // Callback for the "cancel" message - cancels the download.
   void HandleCancel(const base::ListValue* args);
 
   // Callback for the "clearAll" message - clears all the downloads.
   void HandleClearAll(const base::ListValue* args);
 
+  // Callback for the "openDownloadsFolder" message - opens the downloads
+  // folder.
+  void HandleOpenDownloadsFolder(const base::ListValue* args);
+
  private:
   // Send the current list of downloads to the page.
   void SendCurrentDownloads();
 
   // Clear all download items and their observers.
   void ClearDownloadItems();
 
   // Return the download that corresponds to a given id.
   DownloadItem* GetDownloadById(int id);
 
@@ skipping 14 matching lines @@
   // notification should follow close on the heels of such a change.
   typedef std::vector<DownloadItem*> OrderedDownloads;
   OrderedDownloads download_items_;
 
   base::ScopedCallbackFactory<DownloadsDOMHandler> callback_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadsDOMHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_DOWNLOADS_DOM_HANDLER_H_