8328379: Convert URLDragTest.html applet test to main

[toshiogata]

Hi all,

I would like to backport this patch to improve test maintainability. The patch is not clean. A text block needs to be replaced with string literals.
Testing: manually checked URLDragTest.java, and confirmed that the test works in the same way.

Thank you.

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8328379 needs maintainer approval

Issue

• JDK-8328379: Convert URLDragTest.html applet test to main (Bug - P4)

Reviewing

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$ git checkout pull/3002

Update a local copy of the PR:
$ git checkout pull/3002
$ git pull https://git.openjdk.org/jdk11u-dev.git pull/3002/head

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[bridgekeeper]

👋 Welcome back toshiogata! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[toshiogata]

GHA report 1 test failure on macos-x64

• serviceability/sa/ClhsdbFindPC.java#id1

This test failure occurs frequently in recent GHA runs, and is not related to this fix.
Perhaps related issue for this failure is https://bugs.openjdk.org/browse/JDK-8253028

[mlbridge]

Webrevs

• 00: Full (1c1cd2e8)