_MakeGradient
FlatControlLook::_MakeGradient(BGradientLinear& gradient, const BRect& rect,
HaikuControlLook::_MakeGradient(BGradientLinear& gradient, const BRect& rect,
Painter::_MakeGradient(const BGradient& gradient, int32 colorCount,
Painter::_MakeGradient(Array& array, const BGradient& gradient) const