Avoiding multiple text/string parsing while creating TextRun

Source/core/rendering/svg/SVGTextMetricsBuilder.cpp

 /*
  * 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 84 matching lines @@
 void SVGTextMetricsBuilder::initializeMeasurementWithTextRenderer(RenderSVGInlineText* text)
 {
     m_text = text;
     m_textPosition = 0;
     m_currentMetrics = SVGTextMetrics();
     m_complexStartToCurrentMetrics = SVGTextMetrics();
     m_totalWidth = 0;
 
     const Font& scaledFont = text->scaledFont();
     m_run = SVGTextMetrics::constructTextRun(text, 0, text->textLength());
-    m_isComplexText = scaledFont.codePath(m_run) == ComplexPath;
+    CodePath codePath = scaledFont.codePath(m_run);
+    m_isComplexText = codePath == ComplexPath;
+    m_run.setCharacterScanForCodePath(!m_isComplexText);
 
     if (m_isComplexText)
         m_simpleWidthIterator.clear();
     else
         m_simpleWidthIterator = adoptPtr(new WidthIterator(&scaledFont, m_run));
 }
 
 struct MeasureTextData {
     MeasureTextData(SVGCharacterDataMap* characterDataMap)
         : allCharactersMap(characterDataMap)
@@ skipping 102 matching lines @@
 }
 
 void SVGTextMetricsBuilder::buildMetricsAndLayoutAttributes(RenderSVGText* textRoot, RenderSVGInlineText* stopAtLeaf, SVGCharacterDataMap& allCharactersMap)
 {
     ASSERT(textRoot);
     MeasureTextData data(&allCharactersMap);
     walkTree(textRoot, stopAtLeaf, &data);
 }
 
 }