RFR: JDK-8307083: Open source some drag and drop tests 3 [v2]

[Alisen Chung]

> moving tests to open

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

  Update test/jdk/java/awt/dnd/MissedDragEnterTest.java
  
  Co-authored-by: Andrey Turbanov <turbanoff at gmail.com>

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13764/files
  - new: https://git.openjdk.org/jdk/pull/13764/files/849b0013..b99982a8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13764&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13764&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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