Introduce visiblePositionOf() for Position and PositionInComposedTree

Source/core/editing/FrameSelection.cpp

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 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 184 matching lines @@
     }
 }
 
 template <typename Strategy>
 void FrameSelection::setNonDirectionalSelectionIfNeededAlgorithm(const VisibleSelection& passedNewSelection, TextGranularity granularity,
     EndPointsAdjustmentMode endpointsAdjustmentMode)
 {
     VisibleSelection newSelection = passedNewSelection;
     bool isDirectional = shouldAlwaysUseDirectionalSelection(m_frame) || newSelection.isDirectional();
 
-    VisiblePosition base = m_originalBase.isNotNull() ? m_originalBase : VisiblePosition(Strategy::selectionBase(newSelection));
+    VisiblePosition base = m_originalBase.isNotNull() ? m_originalBase : visiblePositionOf(Strategy::selectionBase(newSelection));
     VisiblePosition newBase = base;
-    VisiblePosition extent(Strategy::selectionExtent(newSelection));
+    VisiblePosition extent = visiblePositionOf(Strategy::selectionExtent(newSelection));
     VisiblePosition newExtent = extent;
     if (endpointsAdjustmentMode == AdjustEndpointsAtBidiBoundary)
         adjustEndpointsAtBidiBoundary(newBase, newExtent);
 
     if (newBase.deepEquivalent() != base.deepEquivalent() || newExtent.deepEquivalent() != extent.deepEquivalent()) {
         m_originalBase = base;
         newSelection.setBase(newBase);
         newSelection.setExtent(newExtent);
     } else if (m_originalBase.isNotNull()) {
         if (Strategy::selectionBase(m_selection) == Strategy::selectionBase(newSelection))
@@ skipping 1851 matching lines @@
 
 void showTree(const blink::FrameSelection* sel)
 {
     if (sel)
         sel->showTreeForThis();
     else
         fprintf(stderr, "Cannot showTree for (nil) FrameSelection.\n");
 }
 
 #endif