Modified the flash cipboard interface to add html clipboard support.

ui/base/clipboard/scoped_clipboard_writer.cc

 // Copyright (c) 2012 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.
 
 // This file implements the ScopedClipboardWriter class. Documentation on its
 // purpose can be found in our header. Documentation on the format of the
 // parameters for each clipboard target can be found in clipboard.h.
 
 #include "ui/base/clipboard/scoped_clipboard_writer.h"
 
@@ skipping 105 matching lines @@
   data_parameter.resize(pickle.size());
   memcpy(const_cast<char*>(&data_parameter.front()),
          pickle.data(), pickle.size());
 
   Clipboard::ObjectMapParams parameters;
   parameters.push_back(format_parameter);
   parameters.push_back(data_parameter);
   objects_[Clipboard::CBF_DATA] = parameters;
 }
 
+void ScopedClipboardWriter::Reset() {
+  url_text_.clear();
+  objects_.clear();
+}
+
 void ScopedClipboardWriter::WriteTextOrURL(const string16& text, bool is_url) {
   if (text.empty())
     return;
 
   std::string utf8_text = UTF16ToUTF8(text);
 
   Clipboard::ObjectMapParams parameters;
   parameters.push_back(Clipboard::ObjectMapParam(utf8_text.begin(),
                                                  utf8_text.end()));
   objects_[Clipboard::CBF_TEXT] = parameters;
 
   if (is_url) {
     url_text_ = utf8_text;
   } else {
     url_text_.clear();
   }
 }
 
 }  // namespace ui