RFR: 8235627: Fixed blank stage when running in macOS guest VM

Thu Dec 19 19:24:03 UTC 2019

On Thu, 19 Dec 2019 19:17:34 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> https://bugs.openjdk.java.net/browse/JDK-8235627
> 
> While this looks simple enough, I will also request @arapte to review this, in addition to reviewing it myself.

The fix looks fine to me, but I want to run a couple quick tests.

@fthevenet Please change the title of this PR to exactly match the title of the JBS bug (meaning that you should remove the word "Fixed").

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PR: https://git.openjdk.java.net/jfx/pull/65