Cleanup the GL2PS export private API.
* Make the render window accessible from within GL2PSUtilities during export. * Move Draw3DPath from GL2PSExporter to GL2PSUtilities. * Minor changes to private API function arguments. * Generalize code for projecting points from world coordinates to GL2PS device space. Change-Id: I358b5e0bfeb7bedee5565a0855dcbba913ecc558
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