For directory upload, show empty directories (all directories, in fact) by in...

chrome/browser/file_select_helper.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/browser/file_select_helper.h"
 
 #include <string>
 
 #include "base/file_util.h"
 #include "base/string_split.h"
@@ skipping 78 matching lines @@
   directory_lister_ = new net::DirectoryLister(path,
                                                true,
                                                net::DirectoryLister::NO_SORT,
                                                this);
   if (!directory_lister_->Start())
     FileSelectionCanceled(NULL);
 }
 
 void FileSelectHelper::OnListFile(
     const net::DirectoryLister::DirectoryListerData& data) {
-  // Directory upload only cares about files.  This util call just checks
+  // Directory upload returns directories via a "." file, so that
+  // empty directories are included.  This util call just checks
   // the flags in the structure; there's no file I/O going on.
   if (file_util::FileEnumerator::IsDirectory(data.info))
-    return;
-
-  directory_lister_results_.push_back(data.path);
+    directory_lister_results_.push_back(
+        data.path.Append(FILE_PATH_LITERAL(".")));
+  else
+    directory_lister_results_.push_back(data.path);
 }
 
 void FileSelectHelper::OnListDone(int error) {
   if (!render_view_host_)
     return;
 
   if (error) {
     FileSelectionCanceled(NULL);
     return;
   }
@@ skipping 122 matching lines @@
                                   NULL);
 }
 
 void FileSelectHelper::Observe(NotificationType type,
                                const NotificationSource& source,
                                const NotificationDetails& details) {
   DCHECK(type == NotificationType::RENDER_WIDGET_HOST_DESTROYED);
   DCHECK(Details<RenderViewHost>(details).ptr() == render_view_host_);
   render_view_host_ = NULL;
 }