[SVG2] Add support for the 'turn' unit in <angle>.

Source/wtf/MathExtras.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 190 matching lines @@
 #endif // COMPILER(MSVC)
 
 inline double deg2rad(double d)  { return d * piDouble / 180.0; }
 inline double rad2deg(double r)  { return r * 180.0 / piDouble; }
 inline double deg2grad(double d) { return d * 400.0 / 360.0; }
 inline double grad2deg(double g) { return g * 360.0 / 400.0; }
 inline double turn2deg(double t) { return t * 360.0; }
 inline double deg2turn(double d) { return d / 360.0; }
 inline double rad2grad(double r) { return r * 200.0 / piDouble; }
 inline double grad2rad(double g) { return g * piDouble / 200.0; }
+inline double turn2grad(double t) { return t * 400.0; }
+inline double grad2turn(double g) { return g / 400.f; }
 
 inline float deg2rad(float d)  { return d * piFloat / 180.0f; }
 inline float rad2deg(float r)  { return r * 180.0f / piFloat; }
 inline float deg2grad(float d) { return d * 400.0f / 360.0f; }
 inline float grad2deg(float g) { return g * 360.0f / 400.0f; }
 inline float turn2deg(float t) { return t * 360.0f; }
 inline float deg2turn(float d) { return d / 360.0f; }
 inline float rad2grad(float r) { return r * 200.0f / piFloat; }
 inline float grad2rad(float g) { return g * piFloat / 200.0f; }
+inline float turn2grad(float t) { return t * 400.0f; }
+inline float grad2turn(float g) { return g / 400.f; }
 
 // std::numeric_limits<T>::min() returns the smallest positive value for floating point types
 template<typename T> inline T defaultMinimumForClamp() { return std::numeric_limits<T>::min(); }
 template<> inline float defaultMinimumForClamp() { return -std::numeric_limits<float>::max(); }
 template<> inline double defaultMinimumForClamp() { return -std::numeric_limits<double>::max(); }
 template<typename T> inline T defaultMaximumForClamp() { return std::numeric_limits<T>::max(); }
 
 template<typename T> inline T clampTo(double value, T min = defaultMinimumForClamp<T>(), T max = defaultMaximumForClamp<T>())
 {
     if (value >= static_cast<double>(max))
@@ skipping 90 matching lines @@
     if (i >> 2)
         log2 += 2, i >>= 2;
     if (i >> 1)
         log2 += 1;
     return log2;
 }
 
 } // namespace WTF
 
 #endif // #ifndef WTF_MathExtras_h