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

[Kevin Rushforth]

On Tue, 10 Dec 2019 13:12:37 GMT, Frederic Thevenet <github.com+7450507+fthevenet 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.

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