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

chrome/browser/ui/webui/downloads_dom_handler.h

Index: chrome/browser/ui/webui/downloads_dom_handler.h
diff --git a/chrome/browser/ui/webui/downloads_dom_handler.h b/chrome/browser/ui/webui/downloads_dom_handler.h
index c50ae3de43d03e62b24460db5374ba29ac15c683..d407b665ad9b4887db583f24682d6b5bb57deb65 100644
--- a/chrome/browser/ui/webui/downloads_dom_handler.h
+++ b/chrome/browser/ui/webui/downloads_dom_handler.h
@@ -71,6 +71,10 @@ class DownloadsDOMHandler : public WebUIMessageHandler,
   // 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();