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

third_party/WebKit/Source/core/events/MouseRelatedEvent.cpp

 /*
  * 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, 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 42 matching lines @@
 MouseRelatedEvent::MouseRelatedEvent(
     const AtomicString& eventType,
     bool canBubble,
     bool cancelable,
     AbstractView* abstractView,
     int detail,
     const IntPoint& screenLocation,
     const IntPoint& rootFrameLocation,
     const IntPoint& movementDelta,
     PlatformEvent::Modifiers modifiers,
-    double platformTimeStamp,
+    TimeTicks platformTimeStamp,
     PositionType positionType,
     InputDeviceCapabilities* sourceCapabilities)
     : UIEventWithKeyState(eventType,
                           canBubble,
                           cancelable,
                           abstractView,
                           detail,
                           modifiers,
                           platformTimeStamp,
                           sourceCapabilities),
@@ skipping 174 matching lines @@
   if (!m_hasCachedRelativePosition)
     computeRelativePosition();
   return std::round(m_offsetLocation.y());
 }
 
 DEFINE_TRACE(MouseRelatedEvent) {
   UIEventWithKeyState::trace(visitor);
 }
 
 }  // namespace blink