Introduce {left,right}PositionOf() for VisiblePosition

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 729 matching lines @@
 {
     VisiblePosition pos;
     switch (granularity) {
     case CharacterGranularity:
         if (isRange()) {
             if (directionOfSelection() == LTR)
                 pos = VisiblePosition(m_selection.end(), m_selection.affinity());
             else
                 pos = VisiblePosition(m_selection.start(), m_selection.affinity());
         } else {
-            pos = VisiblePosition(m_selection.extent(), m_selection.affinity()).right();
+            pos = rightPositionOf(VisiblePosition(m_selection.extent(), m_selection.affinity()));
         }
         break;
     case WordGranularity: {
         bool skipsSpaceWhenMovingRight = m_frame && m_frame->editor().behavior().shouldSkipSpaceWhenMovingRight();
         pos = rightWordPosition(VisiblePosition(m_selection.extent(), m_selection.affinity()), skipsSpaceWhenMovingRight);
         break;
     }
     case SentenceGranularity:
     case LineGranularity:
     case ParagraphGranularity:
@@ skipping 148 matching lines @@
 {
     VisiblePosition pos;
     switch (granularity) {
     case CharacterGranularity:
         if (isRange()) {
             if (directionOfSelection() == LTR)
                 pos = VisiblePosition(m_selection.start(), m_selection.affinity());
             else
                 pos = VisiblePosition(m_selection.end(), m_selection.affinity());
         } else {
-            pos = VisiblePosition(m_selection.extent(), m_selection.affinity()).left();
+            pos = leftPositionOf(VisiblePosition(m_selection.extent(), m_selection.affinity()));
         }
         break;
     case WordGranularity: {
         bool skipsSpaceWhenMovingRight = m_frame && m_frame->editor().behavior().shouldSkipSpaceWhenMovingRight();
         pos = leftWordPosition(VisiblePosition(m_selection.extent(), m_selection.affinity()), skipsSpaceWhenMovingRight);
         break;
     }
     case SentenceGranularity:
     case LineGranularity:
     case ParagraphGranularity:
@@ skipping 1139 matching lines @@
 
 void showTree(const blink::FrameSelection* sel)
 {
     if (sel)
         sel->showTreeForThis();
     else
         fprintf(stderr, "Cannot showTree for (nil) FrameSelection.\n");
 }
 
 #endif