Use WTF::TimeTicks to represent timestamp in Platform/Core event types

third_party/WebKit/Source/modules/webmidi/MIDIMessageEvent.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 46 matching lines @@
     return EventNames::MIDIMessageEvent;
   }
 
   DEFINE_INLINE_VIRTUAL_TRACE() {
     visitor->trace(m_data);
     Event::trace(visitor);
   }
 
  private:
   MIDIMessageEvent(double timeStamp, DOMUint8Array* data)
-      : Event(EventTypeNames::midimessage, true, false, timeStamp),
+      : Event(EventTypeNames::midimessage,
+              true,
+              false,
+              TimeTicks() + TimeDelta::FromSecondsD(timeStamp)),
         m_data(data) {}
 
   MIDIMessageEvent(const AtomicString& type,
                    const MIDIMessageEventInit& initializer);
 
   Member<DOMUint8Array> m_data;
 };
 
 }  // namespace blink
 
 #endif  // MIDIMessageEvent_h