RFR: 8307165: java/awt/dnd/NoFormatsDropTest/NoFormatsDropTest.java timed out

[Damon Nguyen]

When converting this test to be applicable to be open sourced, changes were made. I reverted some of these changes to get the test stable again. Now it passes when run on various OS's 100x.

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Commit messages:
 - Revert some test conversion changes
 - Modify waitForIdle
 - Merge branch 'master' of github.com:DamonGuy/jdk
 - Fix rebase issue

Changes: https://git.openjdk.org/jdk/pull/13761/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13761&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307165
  Stats: 6 lines in 1 file changed: 0 ins; 3 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/13761.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13761/head:pull/13761

PR: https://git.openjdk.org/jdk/pull/13761