RFR: 8262091: Add RenderPerfTest for XOR mode rendering

[Ajit Ghaisas]

Add RenderPerfTest for XOR mode rendering of primitives, image and text rendering.

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Commit messages:
 - Add renderperftest for XOR mode

Changes: https://git.openjdk.java.net/lanai/pull/199/files
 Webrev: https://webrevs.openjdk.java.net/?repo=lanai&pr=199&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262091
  Stats: 33 lines in 1 file changed: 33 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/lanai/pull/199.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/199/head:pull/199

PR: https://git.openjdk.java.net/lanai/pull/199