Use high precision timestamp for Event.timestamp

third_party/WebKit/Source/core/events/Event.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, 2007, 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 104 matching lines @@
     void setTarget(PassRefPtrWillBeRawPtr<EventTarget>);
 
     EventTarget* currentTarget() const;
     void setCurrentTarget(EventTarget* currentTarget) { m_currentTarget = currentTarget; }
 
     unsigned short eventPhase() const { return m_eventPhase; }
     void setEventPhase(unsigned short eventPhase) { m_eventPhase = eventPhase; }
 
     bool bubbles() const { return m_canBubble; }
     bool cancelable() const { return m_cancelable; }
-    DOMTimeStamp timeStamp() const { return m_createTime; }
+
+    // Event creation timestamp in milliseconds. If |HiResEventTimeStamp|
+    // runtime feature is enabled it returns a DOMHighResTimeStamp using  the
+    // platform timestamp (see |m_platformTimeStamp|) otherwise it returns a
+    // DOMTimeStamp that represents the current object's construction time (see
+    // |m_createTime|). For more info see http://crbug.com/160524
+    double timeStamp(ScriptState*) const;
+    double platformTimeStamp() const { return m_platformTimeStamp; }
+    void setPlatformTimeStamp(double platformTimeStamp) { m_platformTimeStamp = platformTimeStamp; }
 
     void stopPropagation() { m_propagationStopped = true; }
     void stopImmediatePropagation() { m_immediatePropagationStopped = true; }
 
     // IE Extensions
     EventTarget* srcElement() const { return target(); } // MSIE extension - "the object that fired the event"
 
     bool legacyReturnValue(ExecutionContext*) const;
     void setLegacyReturnValue(ExecutionContext*, bool returnValue);
 
@@ skipping 40 matching lines @@
     Event* underlyingEvent() const { return m_underlyingEvent.get(); }
     void setUnderlyingEvent(PassRefPtrWillBeRawPtr<Event>);
 
     EventPath& eventPath() { ASSERT(m_eventPath); return *m_eventPath; }
     void initEventPath(Node&);
 
     WillBeHeapVector<RefPtrWillBeMember<EventTarget>> path(ScriptState*) const;
 
     bool isBeingDispatched() const { return eventPhase(); }
 
-    double uiCreateTime() const { return m_uiCreateTime; }
-    void setUICreateTime(double uiCreateTime) { m_uiCreateTime = uiCreateTime; }
-
     // Events that must not leak across isolated world, similar to how
     // ErrorEvent behaves, can override this method.
     virtual bool canBeDispatchedInWorld(const DOMWrapperWorld&) const { return true; }
 
     virtual PassRefPtrWillBeRawPtr<EventDispatchMediator> createMediator();
 
     bool isTrusted() const { return m_isTrusted; }
     void setTrusted(bool value) { m_isTrusted = value; }
 
     DECLARE_VIRTUAL_TRACE();
@@ skipping 19 matching lines @@
     unsigned m_defaultHandled:1;
     unsigned m_cancelBubble:1;
     unsigned m_isTrusted : 1;
 
     unsigned short m_eventPhase;
     RefPtrWillBeMember<EventTarget> m_currentTarget;
     RefPtrWillBeMember<EventTarget> m_target;
     DOMTimeStamp m_createTime;
     RefPtrWillBeMember<Event> m_underlyingEvent;
     OwnPtrWillBeMember<EventPath> m_eventPath;
-    double m_uiCreateTime; // For input events, the time the event was recorded by the UI.
+    // The monotonic platform time in seconds, for input events it is the
+    // event timestamp provided by the host OS and reported in the original
+    // WebInputEvent instance.
+    double m_platformTimeStamp;
 };
 
 #define DEFINE_EVENT_TYPE_CASTS(typeName) \
     DEFINE_TYPE_CASTS(typeName, Event, event, event->is##typeName(), event.is##typeName())
 
 } // namespace blink
 
 #endif // Event_h