Implement multi-sample antialiasing on OS X.
Set the necessary attributes to create a sample buffer for the OpenGL context of the vtkCocoaRenderWindow. This allows VTK to do anti-aliased rendering in the window. However, multisampling is turned off by default on OS X because it causes rendering problems on some Mac models. Change-Id: I0ff8073e38d8a63e637cfe4e7146e2d1327d65eb
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