Minor optimization of SVG <textPath> layout

Source/core/rendering/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 537 matching lines @@
             if (textPathOffset < 0) {
                 advanceToNextLogicalCharacter(logicalMetrics);
                 advanceToNextVisualCharacter(visualMetrics);
                 continue;
             }
 
             // Stop processing, if the next character lies behind the path.
             if (textPathOffset > m_textPathLength)
                 break;
 
-            bool ok = false;
-            FloatPoint point = m_textPath.pointAtLength(textPathOffset, ok);
-            ASSERT(ok);
-
+            FloatPoint point;
+            bool ok = m_textPath.pointAndNormalAtLength(textPathOffset, point, angle);
+            ASSERT_UNUSED(ok, ok);
             x = point.x();
             y = point.y();
-            angle = m_textPath.normalAngleAtLength(textPathOffset, ok);
-            ASSERT(ok);
 
             // For vertical text on path, the actual angle has to be rotated 90 degrees anti-clockwise, not the orientation angle!
             if (m_isVerticalText)
                 angle -= 90;
         } else {
             // Apply all previously calculated shift values.
             if (m_isVerticalText) {
                 x += baselineShift;
                 y -= kerning;
             } else {
@@ skipping 70 matching lines @@
     }
 
     if (!didStartTextFragment)
         return;
 
     // Close last open fragment, if needed.
     recordTextFragment(textBox, visualMetricsValues);
 }
 
 }