Returns the preferred size of a layer in its coordinate system.
Original signature is '- (CGSize)preferredSizeOfLayer:(CALayer *)layer;'


- layer (CALayer)
- The layer that requires layout.

The preferred size of the layer.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)