Use high precision timestamp for Event.timestamp

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

Index: third_party/WebKit/Source/core/timing/PerformanceBase.h
diff --git a/third_party/WebKit/Source/core/timing/PerformanceBase.h b/third_party/WebKit/Source/core/timing/PerformanceBase.h
index cd56537ea910464925457528c0340c59e0091624..4df1d0d86f1e3b972e0bf0a8ff62c3885e678bd6 100644
--- a/third_party/WebKit/Source/core/timing/PerformanceBase.h
+++ b/third_party/WebKit/Source/core/timing/PerformanceBase.h
@@ -43,6 +43,10 @@
 
 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;