RFR: JDK-8307083: Open source some drag and drop tests 3 [v4]

[Alisen Chung]

> moving tests to open

Alisen Chung has updated the pull request incrementally with one additional commit since the last revision:

  fix robot timeout

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13764/files
  - new: https://git.openjdk.org/jdk/pull/13764/files/de4cfd7d..c259d2b7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13764&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13764&range=02-03

  Stats: 6 lines in 2 files changed: 0 ins; 2 del; 4 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