Add time stamp to the constructor of the events

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

Index: third_party/WebKit/Source/core/events/MouseEvent.h
diff --git a/third_party/WebKit/Source/core/events/MouseEvent.h b/third_party/WebKit/Source/core/events/MouseEvent.h
index 562c5629a34221fa87813283a764ac15ed62ba72..ffbe045028836d1b0190334c310042ba92b84281 100644
--- a/third_party/WebKit/Source/core/events/MouseEvent.h
+++ b/third_party/WebKit/Source/core/events/MouseEvent.h
@@ -210,7 +210,9 @@ class CORE_EXPORT MouseEvent : public UIEventWithKeyState {
              SyntheticEventType,
              const String& region);
 
-  MouseEvent(const AtomicString& type, const MouseEventInit&);
+  MouseEvent(const AtomicString& type,
+             const MouseEventInit&,
+             TimeTicks platform_time_stamp = TimeTicks::Now());
 
   MouseEvent();