Add time stamp to the constructor of the events

third_party/WebKit/Source/core/events/Event.h

Index: third_party/WebKit/Source/core/events/Event.h
diff --git a/third_party/WebKit/Source/core/events/Event.h b/third_party/WebKit/Source/core/events/Event.h
index affe81af50c1a684f4218de65f692f0c44158537..b5414da7158f6f90d7a6eb12e68afbeefd0cd514 100644
--- a/third_party/WebKit/Source/core/events/Event.h
+++ b/third_party/WebKit/Source/core/events/Event.h
@@ -258,7 +258,11 @@ class CORE_EXPORT Event : public GarbageCollectedFinalized<Event>,
         bool can_bubble,
         bool cancelable,
         ComposedMode = ComposedMode::kScoped);
-  Event(const AtomicString& type, const EventInit&);
+  Event(const AtomicString& type,
+        const EventInit&,
+        TimeTicks platform_time_stamp);
+  Event(const AtomicString& type, const EventInit& init)
+      : Event(type, init, TimeTicks::Now()) {}
 
   virtual void ReceivedTarget();