Add time stamp to the constructor of the events

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

Index: third_party/WebKit/Source/core/events/UIEvent.h
diff --git a/third_party/WebKit/Source/core/events/UIEvent.h b/third_party/WebKit/Source/core/events/UIEvent.h
index 09fb4007b323b34b17e147a290b13c22831ff246..802c9adce2f8b3442cc99388382059dad91d8c1b 100644
--- a/third_party/WebKit/Source/core/events/UIEvent.h
+++ b/third_party/WebKit/Source/core/events/UIEvent.h
@@ -84,7 +84,9 @@ class CORE_EXPORT UIEvent : public Event {
           AbstractView*,
           int detail,
           InputDeviceCapabilities* source_capabilities);
-  UIEvent(const AtomicString&, const UIEventInit&);
+  UIEvent(const AtomicString&,
+          const UIEventInit&,
+          TimeTicks platform_time_stamp = TimeTicks::Now());
 
  private:
   Member<AbstractView> view_;