[jdk11u-dev] RFR: 8274939: Incorrect size of the pixel storage is used by the robot on macOS

[Sergey Bylokhov]

Hi all,
This pull request contains a backport of commit [eff5dafb](https://github.com/openjdk/jdk/commit/eff5dafba9f72bd0612357712ffa472ce1c9166a) from the [openjdk/jdk](https://git.openjdk.java.net/jdk) repository.
The commit being backported was authored by Sergey Bylokhov on 12 Feb 2022 and was reviewed by Alexey Ivanov and Phil Race.

The change is not clean because of the context difference caused by the missing [JDK-8211300](https://bugs.openjdk.org/browse/JDK-8211300) in jdk11u-dev.

Thanks!

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Commit messages:
 - Backport eff5dafba9f72bd0612357712ffa472ce1c9166a

Changes: https://git.openjdk.org/jdk11u-dev/pull/1600/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1600&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8274939
  Stats: 12 lines in 3 files changed: 7 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1600.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1600/head:pull/1600

PR: https://git.openjdk.org/jdk11u-dev/pull/1600