There is no support in Metal framework for XOR mode rendering. It has been implemented in Lanai project as a workaround.

To measure performance of this workaround below tests are used -
   1. J2DBench primitive and image rendering options
   2. RenderPerf tests for primitive, image and text rendering in XOR mode

Build used to tests is post EA-9 build which has some review comment fixes done for JDK-8260931 in addition to EA-9.