At least Controls.CheckBox and Controls.RadioButton benchmarks are broken in build
8.0-controls-scrum-h51. No rendering happens. 8.0-controls-scrum-h51 contains
the following fixes:
  1. RT-23461: partition css selectors into maps for faster lookup (detail)
  2. branch merge (detail)
  3. branch merge (detail)
  4. RT-23461: partition css selectors into maps for faster lookup (detail)
  5. RT-22076: use bits for styleclass (detail)

Looks like one of CSS changes caused this functional regression.

Steps to run benchmarks:
> cd JFX_WS/tests/performance/Controls
> ant
> java -cp "JFX_HOME/rt/lib/jfxrt.jar;./dist/Controls.jar;../FXBenchmark/dist/FXBenchmark.jar"
       controls.CheckboxTest

  or
  java "..." controls.RadioButtonTest