Use high precision timestamp for Event.timestamp

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
+    double timeStamp() const;

[dtapuska, 2015/09/18 16:04:42]

I think there should be a specific call for getting the timestamp from bindings
that you then apply the precision loss calcaulation to.

So that if native code calls this; the timestamp is reflected to the current
time. (Currently there is uiCreateTime which native code can get at the time).

[majidvp, 2015/09/18 17:43:33]

Agreed. I like to keep timeStamp() to be the method used by DOM that applies
precision filtering. This way it is easy to correspond it with IDL. I will use a
different naming for platform timestamp methods. 

+    double timeStampForPlatformInSeconds() const;

[Rick Byers, 2015/09/18 15:56:32]

nit: add comment for the new method (i.e. what "for platform" means).

[majidvp, 2015/09/18 17:43:34]

Acknowledged.

 
     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 82 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.
+    double m_uiCreateTime; // For input events, the time the event was recorded by the UI in seconds.

[dtapuska, 2015/09/18 16:04:42]

When indicating time; be sure to reference what clock. ie; monotonic clock.

[majidvp, 2015/09/18 17:43:34]

Acknowledged.

 };
 
 #define DEFINE_EVENT_TYPE_CASTS(typeName) \
     DEFINE_TYPE_CASTS(typeName, Event, event, event->is##typeName(), event.is##typeName())
 
 } // namespace blink
 
 #endif // Event_h