Resolve light-source position/direction when updated

Source/platform/graphics/filters/LightSource.h

 /*
  * Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2010 Zoltan Herczeg <zherczeg@webkit.org>
  *
  * 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
@@ skipping 59 matching lines @@
 
     virtual PassRefPtr<LightSource> create(const FloatPoint3D& scale, const FloatSize& offset) const = 0;
 
     virtual void initPaintingData(PaintingData&) const = 0;
     // z is a float number, since it is the alpha value scaled by a user
     // specified "surfaceScale" constant, which type is <number> in the SVG standard
     virtual void updatePaintingData(PaintingData&, int x, int y, float z) const = 0;
 
     virtual bool setAzimuth(float) { return false; }
     virtual bool setElevation(float) { return false; }
-    virtual bool setX(float) { return false; }
-    virtual bool setY(float) { return false; }
-    virtual bool setZ(float) { return false; }
-    virtual bool setPointsAtX(float) { return false; }
-    virtual bool setPointsAtY(float) { return false; }
-    virtual bool setPointsAtZ(float) { return false; }
+    virtual bool setPosition(const FloatPoint3D&) { return false; }
+    virtual bool setPointsAt(const FloatPoint3D&) { return false; }
     virtual bool setSpecularExponent(float) { return false; }
     virtual bool setLimitingConeAngle(float) { return false; }
 
 private:
     LightType m_type;
 };
 
 } // namespace WebCore
 
 #endif // LightSource_h