Re: [HighResolutionTime] New worker tests added

My TestUFO website just transmitted a AJAX web visitor log update with a *
backwards-tick* in performance.now() ....
This is a less-than-1-in-1000 occurence, I've reported it to the browser
vendor (  https://bugzilla.mozilla.org/show_bug.cgi?id=908040 )
Some browsers are calling QueryPerformanceCounter() to calculate
performance.now() values on Windows platforms.

There is a known bug on some AMD CPU chipset drivers:
http://stackoverflow.com/questions/644510/cpu-clock-frequency-and-thus-queryperformancecounter-wrong

"QueryPerformanceCounter() and QueryPerformanceFrequency() offer a bit
better resolution, but have different issues. For example in Windows XP,
all AMD Athlon X2 dual core CPUs return the PC of either of the cores
"randomly" (the PC sometimes jumps a bit backwards), unless you specially
install AMD dual core driver package to fix the issue. We haven't noticed
any other dual+ core CPUs having similar issues (p4 dual, p4 ht, core2
dual, core2 quad, phenom quad)."

Microsoft also has a KB article about tick values jumping around too, as
well:
http://support.microsoft.com/kb/274323