RFR: 8316627: JViewport Test headless failure [v4]

[Damon Nguyen]

> Converted test needs headful tag added to avoid failures.

Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:

  Remove viewChanged

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15847/files
  - new: https://git.openjdk.org/jdk/pull/15847/files/46abf98e..cdc2cf88

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15847&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15847&range=02-03

  Stats: 5 lines in 1 file changed: 0 ins; 5 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15847.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15847/head:pull/15847

PR: https://git.openjdk.org/jdk/pull/15847