Use high precision timestamp for Event.timestamp

third_party/WebKit/Source/core/timing/PerformanceBase.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 25 matching lines @@
 #include "core/events/EventTarget.h"
 #include "core/timing/PerformanceEntry.h"
 #include "platform/Timer.h"
 #include "platform/heap/Handle.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
+// Reduce the resolution to 5µs to prevent timing attacks. See:
+// http://www.w3.org/TR/hr-time-2/#privacy-security
+double toSafePrecisionTime(double);

[Rick Byers, 2015/09/25 17:29:33]

Maybe this should be a static method on PerformanceBase or something?  We tend
not to have a lot of global functions like this (but happy to be shown
precedent).

[majidvp, 2015/09/29 14:21:31]

Some one have added an equivalent static method while I was working on this
patch. I switched using that instead.

[Rick Byers, 2015/09/29 15:57:59]

Perfect!  Perhaps worth checking to see who that was and cc'ing them on this?

+
 class Document;
 class ExceptionState;
 class PerformanceObserver;
 class PerformanceTiming;
 class ResourceTimingInfo;
 class UserTiming;
 
 using PerformanceEntryVector = HeapVector<Member<PerformanceEntry>>;
 using PerformanceObservers = HeapListHashSet<Member<PerformanceObserver>>;
 
@@ skipping 69 matching lines @@
     PerformanceEntryTypeMask m_observerFilterOptions;
     PerformanceObservers m_observers;
     PerformanceObservers m_activeObservers;
     PerformanceObservers m_suspendedObservers;
     Timer<PerformanceBase> m_deliverObservationsTimer;
 };
 
 } // namespace blink
 
 #endif // PerformanceBase_h