Invoked when the user resizes the drawer or parent.
Original signature is '- (NSSize)drawerWillResizeContents:(NSDrawer *)sender toSize:(NSSize)contentSize'
Available in Mac OS X v10.0 and later.

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The size that the drawer should be resized to. To resize to a different size, simply return the desired size from this method; to avoid resizing, return the current size.

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