Android implementation of the Gradient View Render

GradientViewRenderer.cs

public void CreateGradient()
{
	//Need to convert the colors to Android Color objects
	int[] androidColors = new int[gradientColors.Count()];

	for (int i = 0; i < gradientColors.Count(); i++)
	{
        	Xamarin.Forms.Color temp = gradientColors[i];
                androidColors[i] = temp.ToAndroid();
	}

	GradientDrawable gradient = new GradientDrawable(GradientDrawable.Orientation.LeftRight, androidColors);

	if (roundCorners)
        	gradient.SetCornerRadii(new float[] { cornerRadius, cornerRadius, cornerRadius, cornerRadius, cornerRadius, cornerRadius, cornerRadius, cornerRadius });

	layout.SetBackground(gradient);
}

what is this layout variable