IPC::ParamTraits for ui::Event (towards ui::Events over mojo IPC)

ui/events/event.cc

Index: ui/events/event.cc
diff --git a/ui/events/event.cc b/ui/events/event.cc
index 0961e156f69cf8b2994f686e3fc3f48410480a58..b9761a6faf5a72b7de199db2de30b48150dcf395 100644
--- a/ui/events/event.cc
+++ b/ui/events/event.cc
@@ -675,6 +675,9 @@ bool KeyEvent::IsRepeated(const KeyEvent& event) {
   return false;
 }
 
+KeyEvent::KeyEvent(EventType type, base::TimeDelta time_stamp, int flags)
+    : Event(type, time_stamp, flags) {}
+
 KeyEvent::KeyEvent(const base::NativeEvent& native_event)
     : Event(native_event,
             EventTypeFromNative(native_event),