node.cloneNode() should clone the value of file upload elements

Source/core/html/forms/FileInputType.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 342 matching lines @@
         filesChosen(firstFileOnly);
     }
     return true;
 }
 
 String FileInputType::droppedFileSystemId()
 {
     return m_droppedFileSystemId;
 }
 
+void FileInputType::copyNonAttributeProperties(const HTMLInputElement& sourceElement)
+{
+    RefPtrWillBeRawPtr<FileList> fileList(FileList::create());
+    FileList* sourceFileList = sourceElement.files();
+    unsigned size = sourceFileList->length();
+    for (unsigned i = 0; i < size; ++i) {
+        File* file = sourceFileList->item(i);
+        fileList->append(File::createWithRelativePath(file->path(), file->webkitRelativePath()));
+    }
+    setFiles(fileList.release());
+}
+
 String FileInputType::defaultToolTip() const
 {
     FileList* fileList = m_fileList.get();
     unsigned listSize = fileList->length();
     if (!listSize) {
         return locale().queryString(WebLocalizedString::FileButtonNoFileSelectedLabel);
     }
 
     StringBuilder names;
     for (size_t i = 0; i < listSize; ++i) {
         names.append(fileList->item(i)->name());
         if (i != listSize - 1)
             names.append('\n');
     }
     return names.toString();
 }
 
 } // namespace WebCore