[jdk11u-dev] RFR: 8264302: Create implementation for Accessibility native peer for Splitpane java role [v2]

[Autumn Capasso]

> This backport is part of the 28 backport Accessibility series JDK-8152350. Tested by building GUI and using the Accessibility components.

Autumn Capasso has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/1808/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/1808/files/b6ea4f64..b6ea4f64

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1808&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1808&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1808.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1808/head:pull/1808

PR: https://git.openjdk.org/jdk11u-dev/pull/1808