RFR: 8316627: JViewport Test headless failure [v3]

[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 size

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15847/files
  - new: https://git.openjdk.org/jdk/pull/15847/files/d36d6a13..46abf98e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15847&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15847&range=01-02

  Stats: 3 lines in 1 file changed: 0 ins; 3 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