Add DocumentMarker::clone()

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

 /*
  * 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.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 23 matching lines @@
 
 class RenderedDocumentMarker final : public DocumentMarker {
  private:
   enum class State { Invalid, ValidNull, ValidNotNull };
 
  public:
   static RenderedDocumentMarker* create(const DocumentMarker& marker) {
     return new RenderedDocumentMarker(marker);
   }
 
+  RenderedDocumentMarker* clone() const final;

[Xiaocheng, 2017/03/30 02:20:28]

Implementation is still needed.

It doesn't matter if we introduce another file. It will soon be removed anyway.

+
   bool isRendered() const { return m_state == State::ValidNotNull; }
   bool contains(const LayoutPoint& point) const {
     DCHECK_EQ(m_state, State::ValidNotNull);
     return m_renderedRect.contains(point);
   }
   void setRenderedRect(const LayoutRect& rect) {
     if (m_state == State::ValidNotNull && rect == m_renderedRect)
       return;
     m_state = State::ValidNotNull;
     m_renderedRect = rect;
   }
 
   const LayoutRect& renderedRect() const {
     DCHECK_EQ(m_state, State::ValidNotNull);
     return m_renderedRect;
   }
 
   void nullifyRenderedRect() {
     m_state = State::ValidNull;
     // Now |m_renderedRect| can not be accessed until |setRenderedRect| is
     // called.
   }
 
   void invalidate() { m_state = State::Invalid; }
   bool isValid() const { return m_state != State::Invalid; }
 
+ protected:
+  RenderedDocumentMarker(RenderedDocumentMarker&) = default;
+
  private:
   explicit RenderedDocumentMarker(const DocumentMarker& marker)
       : DocumentMarker(marker), m_state(State::Invalid) {}
 
   LayoutRect m_renderedRect;
   State m_state;
 };
 
 DEFINE_TYPE_CASTS(RenderedDocumentMarker, DocumentMarker, marker, true, true);
 
 }  // namespace blink
 
 WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(
     blink::RenderedDocumentMarker);
 
 #endif