Constify the rendering/ selection code

Source/core/rendering/InlineTextBox.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 130 matching lines @@
 
 bool InlineTextBox::isSelected(int startPos, int endPos) const
 {
     int sPos = std::max(startPos - m_start, 0);
     // The position after a hard line break is considered to be past its end.
     // See the corresponding code in InlineTextBox::selectionState.
     int ePos = std::min(endPos - m_start, int(m_len) + (isLineBreak() ? 0 : 1));
     return (sPos < ePos);
 }
 
-RenderObject::SelectionState InlineTextBox::selectionState()
+RenderObject::SelectionState InlineTextBox::selectionState() const
 {
     RenderObject::SelectionState state = renderer().selectionState();
     if (state == RenderObject::SelectionStart || state == RenderObject::SelectionEnd || state == RenderObject::SelectionBoth) {
         int startPos, endPos;
         renderer().selectionStartEnd(startPos, endPos);
         // The position after a hard line break is considered to be past its end.
         // See the corresponding code in InlineTextBox::isSelected.
         int lastSelectable = start() + len() - (isLineBreak() ? 1 : 0);
 
         // FIXME: Remove -webkit-line-break: LineBreakAfterWhiteSpace.
@@ skipping 458 matching lines @@
                     continue;
                 paintCompositionUnderline(context, boxOrigin, *it);
             }
         }
     }
 
     if (shouldRotate)
         context->concatCTM(rotation(boxRect, Counterclockwise));
 }
 
-void InlineTextBox::selectionStartEnd(int& sPos, int& ePos)
+void InlineTextBox::selectionStartEnd(int& sPos, int& ePos) const
 {
     int startPos, endPos;
     if (renderer().selectionState() == RenderObject::SelectionInside) {
         startPos = 0;
         endPos = renderer().textLength();
     } else {
         renderer().selectionStartEnd(startPos, endPos);
         if (renderer().selectionState() == RenderObject::SelectionStart)
             endPos = renderer().textLength();
         else if (renderer().selectionState() == RenderObject::SelectionEnd)
@@ skipping 728 matching lines @@
     printedCharacters = fprintf(stderr, "\t%s %p", obj.renderName(), &obj);
     const int rendererCharacterOffset = 24;
     for (; printedCharacters < rendererCharacterOffset; printedCharacters++)
         fputc(' ', stderr);
     fprintf(stderr, "(%d,%d) \"%s\"\n", start(), start() + len(), value.utf8().data());
 }
 
 #endif
 
 } // namespace blink