Scaling and offset fix for FELighting (software and skia paths)

Source/platform/graphics/filters/FELighting.h

 /*
  * Copyright (C) 2010 University of Szeged
  * Copyright (C) 2010 Zoltan Herczeg
  * Copyright (C) 2013 Google 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.
@@ skipping 43 matching lines @@
         SpecularLighting
     };
 
     struct LightingData {
         // This structure contains only read-only (SMP safe) data
         Uint8ClampedArray* pixels;
         float surfaceScale;
         int widthMultipliedByPixelSize;
         int widthDecreasedByOne;
         int heightDecreasedByOne;
+        const LightSource* lightSource;
 
         inline void topLeft(int offset, IntPoint& normalVector);
         inline void topRow(int offset, IntPoint& normalVector);
         inline void topRight(int offset, IntPoint& normalVector);
         inline void leftColumn(int offset, IntPoint& normalVector);
         inline void interior(int offset, IntPoint& normalVector);
         inline void rightColumn(int offset, IntPoint& normalVector);
         inline void bottomLeft(int offset, IntPoint& normalVector);
         inline void bottomRow(int offset, IntPoint& normalVector);
         inline void bottomRight(int offset, IntPoint& normalVector);
@@ skipping 41 matching lines @@
     float m_surfaceScale;
     float m_diffuseConstant;
     float m_specularConstant;
     float m_specularExponent;
     float m_kernelUnitLengthX;
     float m_kernelUnitLengthY;
 
 private:
     virtual void applySoftware() OVERRIDE;
     virtual bool applySkia() OVERRIDE;
+
+    void getTransform(FloatPoint3D* scale, FloatSize* offset) const;
 };
 
 } // namespace WebCore
 
 #endif // FELighting_h