[jdk11u-dev] RFR: 8282276: Problem list failing two Robot Screen Capture tests

[Rui Li]

Clean backport.

Notice that `ScreenCaptureGtkTest.java` is not yet in 11u-dev. I'm still leaving it in the problem list as it can be backported to 11u-dev.

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Commit messages:
 - Backport 2557ef8a02fe19784bd5e605b11d6bd574cde2c2

Changes: https://git.openjdk.org/jdk11u-dev/pull/1386/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1386&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8282276
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1386.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1386/head:pull/1386

PR: https://git.openjdk.org/jdk11u-dev/pull/1386