Add DocumentMarker::clone()

third_party/WebKit/Source/core/editing/markers/DocumentMarker.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 111 matching lines @@
                                           backgroundColor);
 }
 
 inline TextCompositionMarkerDetails* toTextCompositionMarkerDetails(
     DocumentMarkerDetails* details) {
   if (details && details->isComposition())
     return static_cast<TextCompositionMarkerDetails*>(details);
   return nullptr;
 }
 
+DocumentMarker* DocumentMarker::clone() const {
+  return new DocumentMarker(*this);
+}
+
 DocumentMarker::DocumentMarker(MarkerType type,
                                unsigned startOffset,
                                unsigned endOffset,
                                const String& description)
     : m_type(type),
       m_startOffset(startOffset),
       m_endOffset(endOffset),
       m_details(description.isEmpty()
                     ? nullptr
                     : DocumentMarkerDescription::create(description)) {}
@@ skipping 66 matching lines @@
           toTextCompositionMarkerDetails(m_details.get()))
     return details->backgroundColor();
   return Color::transparent;
 }
 
 DEFINE_TRACE(DocumentMarker) {
   visitor->trace(m_details);
 }
 
 }  // namespace blink