Constify the rendering/ selection code

Source/core/rendering/InlineTextBox.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 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 93 matching lines @@
     // charactersWithHyphen, if provided, must not be destroyed before the TextRun.
     TextRun constructTextRun(RenderStyle*, const Font&, StringBuilder* charactersWithHyphen = 0) const;
     TextRun constructTextRun(RenderStyle*, const Font&, StringView, int maximumLength, StringBuilder* charactersWithHyphen = 0) const;
 
 public:
     TextRun constructTextRunForInspector(RenderStyle*, const Font&) const;
     virtual FloatRect calculateBoundaries() const OVERRIDE { return FloatRect(x(), y(), width(), height()); }
 
     virtual LayoutRect localSelectionRect(int startPos, int endPos);
     bool isSelected(int startPos, int endPos) const;
-    void selectionStartEnd(int& sPos, int& ePos);
+    void selectionStartEnd(int& sPos, int& ePos) const;
 
 protected:
     virtual void paint(PaintInfo&, const LayoutPoint&, LayoutUnit lineTop, LayoutUnit lineBottom) OVERRIDE;
     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom) OVERRIDE;
 
 private:
     virtual void deleteLine() OVERRIDE FINAL;
     virtual void extractLine() OVERRIDE FINAL;
     virtual void attachLine() OVERRIDE FINAL;
 
 public:
-    virtual RenderObject::SelectionState selectionState() OVERRIDE FINAL;
+    virtual RenderObject::SelectionState selectionState() const OVERRIDE FINAL;
 
 private:
     virtual void clearTruncation() OVERRIDE FINAL { m_truncation = cNoTruncation; }
     virtual float placeEllipsisBox(bool flowIsLTR, float visibleLeftEdge, float visibleRightEdge, float ellipsisWidth, float &truncatedWidth, bool& foundBox) OVERRIDE FINAL;
 
 public:
     virtual bool isLineBreak() const OVERRIDE FINAL;
 
     void setExpansion(int newExpansion)
     {
@@ skipping 61 matching lines @@
 
 inline AffineTransform InlineTextBox::rotation(const FloatRect& boxRect, RotationDirection rotationDirection)
 {
     return rotationDirection == Clockwise ? AffineTransform(0, 1, -1, 0, boxRect.x() + boxRect.maxY(), boxRect.maxY() - boxRect.x())
         : AffineTransform(0, -1, 1, 0, boxRect.x() - boxRect.maxY(), boxRect.x() + boxRect.maxY());
 }
 
 } // namespace blink
 
 #endif // InlineTextBox_h