Optimize: don't call Math.floor if already 60
Optimize: don't call Math.floor if already 60

Since trackFPS is potentially being called every frame, I believe that not calling Math.floor when it is already 60 can give a fairly non-trivial optimization.
gmac/justice,kendrick-k/justice,okor/justice,kendrick-k/justice,modulexcite/justice,modulexcite/justice,callumacrae/justice