RFR: 8168388: GetMousePositionTest fails with the message "Mouse position should not be null"

[Alexander Zuev]

8168388: GetMousePositionTest fails with the message "Mouse position should not be null"

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Commit messages:
 - 8168388: GetMousePositionTest fails with the message "Mouse position should not be null"

Changes: https://git.openjdk.java.net/jdk/pull/6028/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6028&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8168388
  Stats: 22 lines in 2 files changed: 6 ins; 2 del; 14 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6028.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6028/head:pull/6028

PR: https://git.openjdk.java.net/jdk/pull/6028