Introduce isVisuallyEquivalentCandidate() as replacement of PositionAlgorithm::isCandidate()

Source/core/editing/Position.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 169 matching lines @@
     bool atLastEditingPositionForNode() const;
 
     bool atStartOfTree() const;
     bool atEndOfTree() const;
 
     // These return useful visually equivalent positions.
     // FIXME: We should use mostForwardCaretPosition and mostBackwardPosition.
     PositionAlgorithm<Strategy> upstream(EditingBoundaryCrossingRule = CannotCrossEditingBoundary) const;
     PositionAlgorithm<Strategy> downstream(EditingBoundaryCrossingRule = CannotCrossEditingBoundary) const;
 
-    bool isCandidate() const;
-
     static PositionAlgorithm<Strategy> beforeNode(Node* anchorNode);
     static PositionAlgorithm<Strategy> afterNode(Node* anchorNode);
     static PositionAlgorithm<Strategy> inParentBeforeNode(const Node& anchorNode);
     static PositionAlgorithm<Strategy> inParentAfterNode(const Node& anchorNode);
     static int lastOffsetInNode(Node* anchorNode);
     static PositionAlgorithm<Strategy> firstPositionInNode(Node* anchorNode);
     static PositionAlgorithm<Strategy> lastPositionInNode(Node* anchorNode);
     static int minOffsetForNode(Node* anchorNode, int offset);
     static bool offsetIsBeforeLastNodeOffset(int offset, Node* anchorNode);
     static PositionAlgorithm<Strategy> firstPositionInOrBeforeNode(Node* anchorNode);
@@ skipping 235 matching lines @@
 CORE_EXPORT InlineBoxPosition computeInlineBoxPosition(const PositionInComposedTree&, TextAffinity, TextDirection primaryDirection);
 
 // TODO(yosin) We should move |inRenderedText()| to "VisibleUnits.h" for
 // reduce dependency of |LayoutObject| in |Position| class.
 CORE_EXPORT bool inRenderedText(const Position&);
 CORE_EXPORT bool inRenderedText(const PositionInComposedTree&);
 
 CORE_EXPORT int uncheckedPreviousOffset(const Node*, int current);
 CORE_EXPORT int uncheckedNextOffset(const Node*, int current);
 
+// TODO(yosin) We should move |isVisuallyEquivalentCandidate()| to
+// "VisibleUnits.cpp" to reduce |LayoutObject| dependency in "Position.cpp".
+CORE_EXPORT bool isVisuallyEquivalentCandidate(const Position&);
+CORE_EXPORT bool isVisuallyEquivalentCandidate(const PositionInComposedTree&);
+
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::Position&);
 void showTree(const blink::Position*);
 #endif
 
 #endif // Position_h