Update SVG text layout to use shaped glyph data & go fast (O(n^2)->O(n))

third_party/WebKit/Source/core/layout/svg/SVGTextMetrics.h

 /*
  * Copyright (C) Research In Motion Limited 2010-2012. 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 22 matching lines @@
     DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
 public:
     enum MetricsType {
         SkippedSpaceMetrics
     };
 
     SVGTextMetrics();
     SVGTextMetrics(MetricsType);
     SVGTextMetrics(LineLayoutSVGInlineText, unsigned length, float width);
 
-    static SVGTextMetrics measureCharacterRange(LineLayoutSVGInlineText, unsigned position, unsigned length, TextDirection);
     static TextRun constructTextRun(LineLayoutSVGInlineText, unsigned position, unsigned length, TextDirection);
 
     bool isEmpty() const { return !m_width && !m_height && m_length <= 1; }
 
     float width() const { return m_width; }
     void setWidth(float width) { m_width = width; }
 
     float height() const { return m_height; }
 
     // TODO(kojii): We should store logical width (advance) and height instead
     // of storing physical and calculate logical. crbug.com/544767
     float advance(FontOrientation) const;
     unsigned length() const { return m_length; }
 
 private:
     SVGTextMetrics(LineLayoutSVGInlineText, const TextRun&);
 
     float m_width;
     float m_height;
     unsigned m_length;
 };
 
 } // namespace blink
 
 #endif