From a32b7f7c4e4e31669e0787e6321d74e4db71e514 Mon Sep 17 00:00:00 2001
From: Tom Ritter <tom@mozilla.com>
Date: Tue, 20 Feb 2018 12:18:30 -0600
Subject: Bug 1430173 - Reduce the precision of all explicit clocks to 2ms.
 r=baku, a=RyanVM

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
---
 js/src/jsdate.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
 mode change 100644 => 100755 js/src/jsdate.cpp

(limited to 'js/src/jsdate.cpp')

diff --git a/js/src/jsdate.cpp b/js/src/jsdate.cpp
old mode 100644
new mode 100755
index d73fb93d2..ccaeda2a3
--- a/js/src/jsdate.cpp
+++ b/js/src/jsdate.cpp
@@ -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
-- 
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