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

third_party/WebKit/Source/core/events/MouseRelatedEvent.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 Apple Computer, Inc.
  *
  * 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 90 matching lines @@
   // https://crbug.com/476530.
   MouseRelatedEvent(const AtomicString& type,
                     bool canBubble,
                     bool cancelable,
                     AbstractView*,
                     int detail,
                     const IntPoint& screenLocation,
                     const IntPoint& rootFrameLocation,
                     const IntPoint& movementDelta,
                     PlatformEvent::Modifiers,
-                    double platformTimeStamp,
+                    TimeTicks platformTimeStamp,
                     PositionType,
                     InputDeviceCapabilities* sourceCapabilities = nullptr);
 
   MouseRelatedEvent(const AtomicString& type,
                     const MouseEventInit& initializer);
 
   void initCoordinates(const double clientX, const double clientY);
   void receivedTarget() final;
 
   void computePageLocation();
   void computeRelativePosition();
 
   // Expose these so MouseEvent::initMouseEvent can set them.
   DoublePoint m_screenLocation;
   DoublePoint m_clientLocation;
   DoublePoint m_movementDelta;
 
  private:
   DoublePoint m_pageLocation;
   DoublePoint m_layerLocation;
   DoublePoint m_offsetLocation;
   DoublePoint m_absoluteLocation;
   PositionType m_positionType;
   bool m_hasCachedRelativePosition;
 };
 
 }  // namespace blink
 
 #endif  // MouseRelatedEvent_h