RFR: 8303826: Add FX test for JDK-8252255

[Prasanta Sadhukhan]

Manual regression test for 8252255: Blurry rendering of SwingNode with HiDPI scaling in JavaFX is added

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Commit messages:
 - 8303826: Add FX test for JDK-8252255
 - 8303826: Add FX test for JDK-8252255

Changes: https://git.openjdk.org/jfx/pull/1282/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1282&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303826
  Stats: 155 lines in 1 file changed: 155 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1282.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1282/head:pull/1282

PR: https://git.openjdk.org/jfx/pull/1282