function GradientColor(type, direction, numStops, arrGradientStop)
{
    this.type = type;
    this.direction = direction;
    this.numStops = numStops;
    this.arrGradientStop = arrGradientStop;
}
@class GradientColor
Stores gradient color information.

@param type          The gradient type, must be "linear".
@param direction     A \c #Direction object for the direction of the gradient
                (up, down, right, or left).
@param numStops          The number of stops in the gradient.
@param gradientStopList  An array of \c #GradientStop objects.

@return A new \c GradientColor object.