Expose InlineTextBoxes in the accessibility tree.

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 141 matching lines @@
 
 private:
     float textPos() const; // returns the x position relative to the left start of the text line.
 
 public:
     virtual int offsetForPosition(float x, bool includePartialGlyphs = true) const;
     virtual float positionForOffset(int offset) const;
 
     bool containsCaretOffset(int offset) const; // false for offset after line break
 
+    // Fills a vector with the pixel width of each character.
+    void characterWidths(Vector<float>&) const;
+
 private:
     InlineTextBox* m_prevTextBox; // The previous box that also uses our RenderObject
     InlineTextBox* m_nextTextBox; // The next box that also uses our RenderObject
 
     int m_start;
     unsigned short m_len;
 
     unsigned short m_truncation; // Where to truncate when text overflow is applied.  We use special constants to
                       // denote no truncation (the whole run paints) and full truncation (nothing paints at all).
 
@@ skipping 33 matching lines @@
 inline RenderText* InlineTextBox::textRenderer() const
 {
     return toRenderText(renderer());
 }
 
 void alignSelectionRectToDevicePixels(FloatRect&);
 
 } // namespace WebCore
 
 #endif // InlineTextBox_h