Introduce composed tree version of nextVisuallyDistinctCandidate()

Source/core/editing/EditingUtilities.h

 /*
  * Copyright (C) 2004, 2006, 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 144 matching lines @@
 // Position
 // -------------------------------------------------------------------------
 
 // Functions returning Position
 
 Position nextCandidate(const Position&);
 PositionInComposedTree nextCandidate(const PositionInComposedTree&);
 Position previousCandidate(const Position&);
 PositionInComposedTree previousCandidate(const PositionInComposedTree&);
 
-Position nextVisuallyDistinctCandidate(const Position&);
+CORE_EXPORT Position nextVisuallyDistinctCandidate(const Position&);
+CORE_EXPORT PositionInComposedTree nextVisuallyDistinctCandidate(const PositionInComposedTree&);
 Position previousVisuallyDistinctCandidate(const Position&);
 PositionInComposedTree previousVisuallyDistinctCandidate(const PositionInComposedTree&);
 
 Position positionBeforeContainingSpecialElement(const Position&, HTMLElement** containingSpecialElement = nullptr);
 Position positionAfterContainingSpecialElement(const Position&, HTMLElement** containingSpecialElement = nullptr);
 
 inline Position firstPositionInOrBeforeNode(Node* node)
 {
     return Position::firstPositionInOrBeforeNode(node);
 }
@@ skipping 129 matching lines @@
     // FIXME: this is required until 6853027 is fixed and text checking can do this for us.
     return character == '\'' || character == rightSingleQuotationMarkCharacter || character == hebrewPunctuationGershayimCharacter;
 }
 
 String stringWithRebalancedWhitespace(const String&, bool startIsStartOfParagraph, bool endIsEndOfParagraph);
 const String& nonBreakingSpaceString();
 
 }
 
 #endif