Introduce composed tree version of VisiblePosition

Source/core/editing/VisibleSelection.h

 /*
  * Copyright (C) 2004 Apple Computer, 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 79 matching lines @@
         static EphemeralRangeInComposedTree asRange(const VisibleSelection&);
         static bool equalSelections(const VisibleSelection&, const VisibleSelection&);
         static bool isRange(const VisibleSelection& selection) { return selectionType(selection) == RangeSelection; }
         static PositionType selectionBase(const VisibleSelection& selection) { return selection.baseInComposedTree(); }
         static PositionType selectionExtent(const VisibleSelection& selection) { return selection.extentInComposedTree(); }
         static PositionType selectionStart(const VisibleSelection& selection) { return selection.startInComposedTree(); }
         static PositionType selectionEnd(const VisibleSelection& selection) { return selection.endInComposedTree(); }
         static SelectionType selectionType(const VisibleSelection& selection) { return selection.selectionTypeInComposedTree(); }
         static VisiblePosition selectionVisibleStart(const VisibleSelection& selection)
         {
-            return createVisiblePosition(selectionStart(selection), isRange(selection) ? TextAffinity::Downstream : selection.affinity());
+            return createVisiblePositionInDOMTree(selectionStart(selection), isRange(selection) ? TextAffinity::Downstream : selection.affinity());
         }
         static VisiblePosition selectionVisibleEnd(const VisibleSelection& selection)
         {
-            return createVisiblePosition(selectionEnd(selection), isRange(selection) ? TextAffinity::Upstream : selection.affinity());
+            return createVisiblePositionInDOMTree(selectionEnd(selection), isRange(selection) ? TextAffinity::Upstream : selection.affinity());
         }
         static PositionType toPositionType(const Position& position) { return toPositionInComposedTree(position); }
     };
 
     VisibleSelection();
 
     VisibleSelection(const Position&, TextAffinity, bool isDirectional = false);
     VisibleSelection(const Position& base, const Position& extent, TextAffinity = SEL_DEFAULT_AFFINITY, bool isDirectional = false);
     VisibleSelection(const PositionInComposedTree& base, const PositionInComposedTree& extent, TextAffinity = SEL_DEFAULT_AFFINITY, bool isDirectional = false);
 
@@ skipping 143 matching lines @@
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::VisibleSelection&);
 void showTree(const blink::VisibleSelection*);
 #endif
 
 #endif // VisibleSelection_h