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
---
 dom/events/Event.cpp | 7 +++++++
 dom/events/Event.h   | 1 +
 2 files changed, 8 insertions(+)
 mode change 100644 => 100755 dom/events/Event.cpp
 mode change 100644 => 100755 dom/events/Event.h

(limited to 'dom/events')

diff --git a/dom/events/Event.cpp b/dom/events/Event.cpp
old mode 100644
new mode 100755
index a85a0d66b..2af34136e
--- a/dom/events/Event.cpp
+++ b/dom/events/Event.cpp
@@ -32,6 +32,7 @@
 #include "nsJSEnvironment.h"
 #include "nsLayoutUtils.h"
 #include "nsPIWindowRoot.h"
+#include "mozilla/TimerClamping.h"
 #include "WorkerPrivate.h"
 
 namespace mozilla {
@@ -1084,6 +1085,12 @@ Event::DefaultPrevented(JSContext* aCx) const
 
 double
 Event::TimeStamp() const
+{
+  return TimerClamping::ReduceMsTimeValue(TimeStampImpl());
+}
+
+double
+Event::TimeStampImpl() const
 {
   if (!sReturnHighResTimeStamp) {
     return static_cast<double>(mEvent->mTime);
diff --git a/dom/events/Event.h b/dom/events/Event.h
old mode 100644
new mode 100755
index 4ac6a68d5..c28226e8a
--- a/dom/events/Event.h
+++ b/dom/events/Event.h
@@ -62,6 +62,7 @@ private:
   void ConstructorInit(EventTarget* aOwner,
                        nsPresContext* aPresContext,
                        WidgetEvent* aEvent);
+  double TimeStampImpl() const;
 
 public:
   static Event* FromSupports(nsISupports* aSupports)
-- 
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