commit 1dd1d5c72cecfdfbee6b8526553407d84724dbdd Author: Mike Perry <mikeperry-git@torproject.org> Date: Wed Jun 24 17:50:31 2015 -0700 fixup! Bug 1517: Reduce precision of time for Javascript. Address worker thread performance.now() and also clip dom highres timestamps at 1ms in other cases (such as requestAnimationFrame()). --- dom/base/nsDOMNavigationTiming.h | 2 +- dom/workers/Performance.cpp | 5 ++--- 2 files changed, 3 insertions(+), 4 deletions(-) diff --git a/dom/base/nsDOMNavigationTiming.h b/dom/base/nsDOMNavigationTiming.h index 7ae592c..e610891 100644 --- a/dom/base/nsDOMNavigationTiming.h +++ b/dom/base/nsDOMNavigationTiming.h @@ -91,7 +91,7 @@ public: inline DOMHighResTimeStamp TimeStampToDOMHighRes(mozilla::TimeStamp aStamp) { mozilla::TimeDuration duration = aStamp - mNavigationStartTimeStamp; - return duration.ToMilliseconds(); + return floor(duration.ToMilliseconds()); // Clamp to milliseconds at least } private: diff --git a/dom/workers/Performance.cpp b/dom/workers/Performance.cpp index 366e3ab..8dea08b 100644 --- a/dom/workers/Performance.cpp +++ b/dom/workers/Performance.cpp @@ -34,9 +34,8 @@ Performance::WrapObject(JSContext* aCx) double Performance::Now() const { - TimeDuration duration = - TimeStamp::Now() - mWorkerPrivate->NowBaseTimeStamp(); - return duration.ToMilliseconds(); + TimeDuration duration = TimeStamp::Now() - mWorkerPrivate->NowBaseTimeStamp(); + return floor(duration.ToMilliseconds()/100.0)*100.0; } END_WORKERS_NAMESPACE