Store a <scale, bias> tuple for textLength scale adjustment

third_party/WebKit/Source/core/layout/svg/SVGTextLayoutEngine.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 505 matching lines @@
                 m_currentTextFragment.transform.rotate(angle);
 
             if (textPathShiftX || textPathShiftY)
                 m_currentTextFragment.transform.translate(textPathShiftX, textPathShiftY);
 
             // In vertical text, always rotate by 90 degrees regardless of fontOrientation.
             // Shaping engine takes care of the necessary orientation.
             if (m_isVerticalText)
                 m_currentTextFragment.transform.rotate(90);
 
+            m_currentTextFragment.isVertical = m_isVerticalText;
             m_currentTextFragment.isTextOnPath = m_inPathLayout && m_textPathScaling != 1;
-            if (m_currentTextFragment.isTextOnPath) {
-                if (m_isVerticalText)
-                    m_currentTextFragment.lengthAdjustTransform.scaleNonUniform(1, m_textPathScaling);
-                else
-                    m_currentTextFragment.lengthAdjustTransform.scaleNonUniform(m_textPathScaling, 1);
-            }
+            if (m_currentTextFragment.isTextOnPath)
+                m_currentTextFragment.lengthAdjustScale = m_textPathScaling;
         }
 
         // Update current text position, after processing of the current character finished.
         if (m_inPathLayout) {
             updateCurrentTextPosition(x, y, glyphAdvance);
         } else {
             // Apply CSS 'kerning', 'letter-spacing' and 'word-spacing' to next character, if needed.
             if (spacing)
                 applySpacingToNextCharacter = true;
 
@@ skipping 14 matching lines @@
     }
 
     if (!didStartTextFragment)
         return;
 
     // Close last open fragment, if needed.
     recordTextFragment(textBox);
 }
 
 }