Introduce Position::IsEquivalent()

third_party/WebKit/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 154 matching lines @@
   // Note: Comparison of positions require both parameters are non-null. You
   // should check null-position before comparing them.
   // TODO(yosin): We should use |Position::operator<()| instead of
   // |Position::comapreTo()| to utilize |DHCECK_XX()|.
   int CompareTo(const PositionTemplate<Strategy>&) const;
   bool operator<(const PositionTemplate<Strategy>&) const;
   bool operator<=(const PositionTemplate<Strategy>&) const;
   bool operator>(const PositionTemplate<Strategy>&) const;
   bool operator>=(const PositionTemplate<Strategy>&) const;
 
+  bool IsEquivalent(const PositionTemplate<Strategy>&) const;
+
   // These can be either inside or just before/after the node, depending on
   // if the node is ignored by editing or not.
   // FIXME: These should go away. They only make sense for legacy positions.
   bool AtFirstEditingPositionForNode() const;
   bool AtLastEditingPositionForNode() const;
 
   bool AtStartOfTree() const;
   bool AtEndOfTree() const;
 
   static PositionTemplate<Strategy> BeforeNode(Node* anchor_node);
@@ skipping 90 matching lines @@
 
 }  // 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