Add DocumentMarker::clone()

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

 /*
  * This file is part of the DOM implementation for WebCore.
  *
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * 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.
  *
@@ skipping 127 matching lines @@
                  unsigned startOffset,
                  unsigned endOffset,
                  const String& description);
   DocumentMarker(unsigned startOffset, unsigned endOffset, bool activeMatch);
   DocumentMarker(unsigned startOffset,
                  unsigned endOffset,
                  Color underlineColor,
                  bool thick,
                  Color backgroundColor);
 
-  DocumentMarker(const DocumentMarker&);
+  DocumentMarker* cloneWithNewOffsets(unsigned startOffset,
+                                      unsigned endOffset) const;
 
   MarkerType type() const { return m_type; }
   unsigned startOffset() const { return m_startOffset; }
   unsigned endOffset() const { return m_endOffset; }
 
   const String& description() const;
   bool activeMatch() const;
   Color underlineColor() const;
   bool thick() const;
   Color backgroundColor() const;
@@ skipping 10 matching lines @@
 
   bool operator==(const DocumentMarker& o) const {
     return type() == o.type() && startOffset() == o.startOffset() &&
            endOffset() == o.endOffset();
   }
 
   bool operator!=(const DocumentMarker& o) const { return !(*this == o); }
 
   DECLARE_TRACE();
 
+ protected:
+  DocumentMarker(const DocumentMarker&);
+  virtual DocumentMarker* clone() const;
+
  private:
   MarkerType m_type;
   unsigned m_startOffset;
   unsigned m_endOffset;
   Member<DocumentMarkerDetails> m_details;
 };
 
 using DocumentMarkerVector = HeapVector<Member<DocumentMarker>>;
 
 inline DocumentMarkerDetails* DocumentMarker::details() const {
   return m_details.get();
 }
 
 class DocumentMarkerDetails
     : public GarbageCollectedFinalized<DocumentMarkerDetails> {
  public:
   DocumentMarkerDetails() {}
   virtual ~DocumentMarkerDetails();
   virtual bool isDescription() const { return false; }
   virtual bool isTextMatch() const { return false; }
   virtual bool isComposition() const { return false; }
 
   DEFINE_INLINE_VIRTUAL_TRACE() {}
 };
 
 }  // namespace blink
 
 #endif  // DocumentMarker_h