[jdk11u-dev] RFR: 8264299: Create implementation of native accessibility peer for ScrollPane and ScrollBar Java Accessibility roles

[Autumn Capasso]

Clean backport [JDK-8264299](https://bugs.openjdk.org/browse/JDK-8264299) This backport is part of the 28 backport Accessibility series [JDK-8152350](https://bugs.openjdk.org/browse/JDK-8152350).

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Commit messages:
 - Backport 6c107fdff289cc553df12ee10b0c8002b84059b2
 - Backport 9d669c912d3977027f321a5e6b7f045ca2ce9482)

Changes: https://git.openjdk.org/jdk11u-dev/pull/1704/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1704&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8264299
  Stats: 509 lines in 8 files changed: 363 ins; 135 del; 11 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1704.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1704/head:pull/1704

PR: https://git.openjdk.org/jdk11u-dev/pull/1704