addMarker() optimizations.

Source/core/dom/DocumentMarkerController.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 69 matching lines @@
     Vector<IntRect> renderedRectsForMarkers(DocumentMarker::MarkerType);
 
 #ifndef NDEBUG
     void showMarkers() const;
 #endif
 
 private:
     void addMarker(Node*, const DocumentMarker&);
 
     typedef Vector<RenderedDocumentMarker> MarkerList;
-    typedef HashMap<RefPtr<Node>, OwnPtr<MarkerList> > MarkerMap;
+    typedef Vector<OwnPtr<MarkerList>, DocumentMarker::MarkerTypeIndexesCount> MarkerLists;
+    typedef HashMap<RefPtr<Node>, OwnPtr<MarkerLists> > MarkerMap;
+    void mergeOverlapping(MarkerList*, DocumentMarker&);
     bool possiblyHasMarkers(DocumentMarker::MarkerTypes);
     void removeMarkersFromList(MarkerMap::iterator, DocumentMarker::MarkerTypes);
 
     MarkerMap m_markers;
     // Provide a quick way to determine whether a particular marker type is absent without going through the map.
     DocumentMarker::MarkerTypes m_possiblyExistingMarkerTypes;
 };
 
 } // namespace WebCore
 
 #ifndef NDEBUG
 void showDocumentMarkers(const WebCore::DocumentMarkerController*);
 #endif
 
 #endif // DocumentMarkerController_h