RFR: 8291853: [CSS] ClassCastException in CssStyleHelper calculateValue [v2]

[Andy Goryachev]

> A race condition exists where a derived color depends on another derived color which has not been yet defined or processed.  The only side effect of this condition is a ClassCastException - the color eventually gets resolved.
> 
> Solution: initialize the derived color to transparent earlier to suppress the exception.
> 
> This was also a test bug https://bugs.openjdk.org/browse/JDK-8198604

Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:

  8291853: review comments

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Changes:
  - all: https://git.openjdk.org/jfx/pull/947/files
  - new: https://git.openjdk.org/jfx/pull/947/files/bce67a30..8f03d459

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=947&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=947&range=00-01

  Stats: 6 lines in 1 file changed: 3 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/947.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/947/head:pull/947

PR: https://git.openjdk.org/jfx/pull/947