Constructor that creates a Brush fill, using a user-supplied, custom
Brush. The brush will be scaled to fit the destination screen object
according to the parameter.
- brush (Brush)
- The Brush to use for fancy fills. Typically, this would be a LinearGradientBrush or a TextureBrush class
- isScaled (Boolean)
- Determines if the brush will be scaled to fit the bounding box of the destination object. true to scale it, false to leave it unscaled
