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Bug 1427870 - Change resolution of .now() to 20us. r=bkelly, a=lizzard

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The comment about workers was introduced in Bug 1186489 but became obsolete some time after that
(definitely by Bug 1278838)
This commit is contained in:
Tom Ritter 2017-12-30 13:07:00 -06:00
parent b6e7d3a2ba
commit 29a0059ef9
1 changed files with 3 additions and 4 deletions
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7
dom/performance/Performance.cpp
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@ -243,10 +243,9 @@ Performance::ClearResourceTimings()
DOMHighResTimeStamp
Performance::RoundTime(double aTime) const
{
// Round down to the nearest 5us, because if the timer is too accurate people
// can do nasty timing attacks with it. See similar code in the worker
// Performance implementation.
const double maxResolutionMs = 0.005;
// Round down to the nearest 20us, because if the timer is too accurate people
// can do nasty timing attacks with it.
const double maxResolutionMs = 0.020;
return nsRFPService::ReduceTimePrecisionAsMSecs(
floor(aTime / maxResolutionMs) * maxResolutionMs);
}