[jfx11u] RFR: 8289587: IllegalArgumentException: Color.rgb's red parameter (-16776961) expects color values 0-255

[Ambarish Rapte]

Clean backport to jfx11u.

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Commit messages:
 - 8289587: IllegalArgumentException: Color.rgb's red parameter (-16776961) expects color values 0-255

Changes: https://git.openjdk.org/jfx11u/pull/106/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx11u&pr=106&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289587
  Stats: 180 lines in 3 files changed: 174 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jfx11u/pull/106.diff
  Fetch: git fetch https://git.openjdk.org/jfx11u pull/106/head:pull/106

PR: https://git.openjdk.org/jfx11u/pull/106