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

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

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 39 matching lines @@
                             int screenX,
                             int screenY,
                             int windowX,
                             int windowY,
                             int movementX,
                             int movementY,
                             PlatformEvent::Modifiers,
                             short button,
                             unsigned short buttons,
                             EventTarget* relatedTarget,
-                            double platformTimeStamp,
+                            TimeTicks platformTimeStamp,
                             PlatformMouseEvent::SyntheticEventType,
                             const String& region,
                             const PlatformMouseEvent*);
 
   static MouseEvent* create(const AtomicString& eventType,
                             AbstractView*,
                             const PlatformMouseEvent&,
                             int detail,
                             Node* relatedTarget);
 
@@ skipping 74 matching lines @@
              int screenX,
              int screenY,
              int windowX,
              int windowY,
              int movementX,
              int movementY,
              PlatformEvent::Modifiers,
              short button,
              unsigned short buttons,
              EventTarget* relatedTarget,
-             double platformTimeStamp,
+             TimeTicks platformTimeStamp,
              PlatformMouseEvent::SyntheticEventType,
              const String& region,
              const PlatformMouseEvent*);
 
   MouseEvent(const AtomicString& type, const MouseEventInit&);
 
   MouseEvent();
 
   short rawButton() const { return m_button; }
 
@@ skipping 31 matching lines @@
   MouseEvent& event() const;
 
   DispatchEventResult dispatchEvent(EventDispatcher&) const override;
 };
 
 DEFINE_EVENT_TYPE_CASTS(MouseEvent);
 
 }  // namespace blink
 
 #endif  // MouseEvent_h