RFR: JDK-8328225: Convert ImageDecoratedDnD.html applet test to main [v3]

[Harshitha Onkar]

> Following test is converted to main using PassFailJFrame.

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

 - minor fix
 - instruction line-lengths

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/18315/files
  - new: https://git.openjdk.org/jdk/pull/18315/files/8ec60632..7e35e23d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18315&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18315&range=01-02

  Stats: 14 lines in 1 file changed: 1 ins; 0 del; 13 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