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Bug 1430173 - Reduce the precision of all explicit clocks to 2ms. r=baku, a=RyanVM

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Backport to ESR where we don't have the ResistFingerprinting component.

MozReview-Commit-ID: 9bjycHjR3SF

--HG--
extra : transplant_source : %EA%03%21%0A%E9%3F%8E%CD%7C%D79f%96%85%96%00%5D%7F%95X
This commit is contained in:
Tom Ritter 2018-02-20 12:18:30 -06:00 • committed by Roy Tam
commit c66f2e1613
14 changed files with 109 additions and 33 deletions
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5
js/src/jsdate.cpp Normal file → Executable file
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@ -1232,7 +1232,10 @@ date_parse(JSContext* cx, unsigned argc, Value* vp)
static ClippedTime
NowAsMillis()
{
return TimeClip(static_cast<double>(PRMJ_Now()) / PRMJ_USEC_PER_MSEC);
const double maxResolutionMs = 2;
double timestamp = static_cast<double>(PRMJ_Now()) / PRMJ_USEC_PER_MSEC;
timestamp = floor(timestamp / maxResolutionMs) * maxResolutionMs;
return TimeClip(timestamp);
}
bool