Fix handling of Arabic script in SVGTextContentElement.getSubStringLength

Source/core/layout/svg/SVGTextQuery.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 238 matching lines @@
 
 bool SVGTextQuery::subStringLengthCallback(Data* queryData, const SVGTextFragment& fragment) const
 {
     SubStringLengthData* data = static_cast<SubStringLengthData*>(queryData);
 
     int startPosition = data->startPosition;
     int endPosition = startPosition + data->length;
     if (!mapStartEndPositionsIntoFragmentCoordinates(queryData, fragment, startPosition, endPosition))
         return false;
 
-    SVGTextMetrics metrics = SVGTextMetrics::measureCharacterRange(queryData->textLayoutObject, fragment.characterOffset + startPosition, endPosition - startPosition, queryData->textLayoutObject->styleRef().direction());
+    SVGTextMetrics metrics = SVGTextMetrics::measureCharacterRange(queryData->textLayoutObject, fragment.characterOffset + startPosition, endPosition - startPosition, queryData->textBox->direction());
     data->subStringLength += queryData->isVerticalText ? metrics.height() : metrics.width();
     return false;
 }
 
 float SVGTextQuery::subStringLength(unsigned startPosition, unsigned length) const
 {
     SubStringLengthData data(startPosition, length);
     executeQuery(&data, &SVGTextQuery::subStringLengthCallback);
     return data.subStringLength;
 }
@@ skipping 238 matching lines @@
 int SVGTextQuery::characterNumberAtPosition(const FloatPoint& position) const
 {
     CharacterNumberAtPositionData data(position);
     if (!executeQuery(&data, &SVGTextQuery::characterNumberAtPositionCallback))
         return -1;
 
     return data.processedCharacters;
 }
 
 }