RFR: JDK-8328225: Convert ImageDecoratedDnD.html applet test to main [v4]

[Harshitha Onkar]

> Following test is converted to main using PassFailJFrame.

Harshitha Onkar has updated the pull request incrementally with three additional commits since the last revision:

 - frame.setSize() used
 - review update
 - review update

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18315/files
  - new: https://git.openjdk.org/jdk/pull/18315/files/7e35e23d..6c522e53

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18315&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18315&range=02-03

  Stats: 11 lines in 1 file changed: 2 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/18315.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18315/head:pull/18315

PR: https://git.openjdk.org/jdk/pull/18315