RFR: JDK-8307083: Open source some drag and drop tests 3

[Alisen Chung]

moving tests to open

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Commit messages:
 - added tests to open

Changes: https://git.openjdk.org/jdk/pull/13764/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13764&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307083
  Stats: 895 lines in 4 files changed: 895 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13764.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13764/head:pull/13764

PR: https://git.openjdk.org/jdk/pull/13764