Make first-letter style to work with editing

Source/core/rendering/RenderText.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 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 36 matching lines @@
     virtual bool isWordBreak() const;
 
     virtual PassRefPtr<StringImpl> originalText() const;
 
     void extractTextBox(InlineTextBox*);
     void attachTextBox(InlineTextBox*);
     void removeTextBox(InlineTextBox*);
 
     const String& text() const { return m_text; }
     String textWithoutTranscoding() const;
+    virtual unsigned textStartOffset() const { return 0; }
 
     InlineTextBox* createInlineTextBox();
     void dirtyLineBoxes(bool fullLayout);
 
     virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const OVERRIDE FINAL;
     void absoluteRectsForRange(Vector<IntRect>&, unsigned startOffset = 0, unsigned endOffset = INT_MAX, bool useSelectionHeight = false, bool* wasFixed = 0);
 
     virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const OVERRIDE FINAL;
     void absoluteQuadsForRange(Vector<FloatQuad>&, unsigned startOffset = 0, unsigned endOffset = INT_MAX, bool useSelectionHeight = false, bool* wasFixed = 0);
 
@@ skipping 172 matching lines @@
 inline void RenderText::checkConsistency() const
 {
 }
 #endif
 
 void applyTextTransform(const RenderStyle*, String&, UChar);
 
 } // namespace WebCore
 
 #endif // RenderText_h