Populates sourceDevice attribute into MouseEvent

Source/core/events/UIEvent.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 35 matching lines @@
     , m_view(initializer.view())
     , m_detail(initializer.detail())
     , m_sourceDevice(initializer.sourceDevice())
 {
 }
 
 UIEvent::~UIEvent()
 {
 }
 
-void UIEvent::initUIEvent(const AtomicString& typeArg, bool canBubbleArg, bool cancelableArg, PassRefPtrWillBeRawPtr<AbstractView> viewArg, int detailArg)
+void UIEvent::initUIEvent(const AtomicString& typeArg, bool canBubbleArg, bool cancelableArg, PassRefPtrWillBeRawPtr<AbstractView> viewArg, int detailArg, InputDevice* sourceDevice)
 {
     if (dispatched())
         return;
 
     initEvent(typeArg, canBubbleArg, cancelableArg);
 
     m_view = viewArg;
     m_detail = detailArg;
-    m_sourceDevice = nullptr;
+    m_sourceDevice = sourceDevice;
+}
+
+void UIEvent::initUIEvent(const AtomicString& typeArg, bool canBubbleArg, bool cancelableArg, PassRefPtrWillBeRawPtr<AbstractView> viewArg, int detailArg)
+{
+    initUIEvent(typeArg, canBubbleArg, cancelableArg, viewArg, detailArg, nullptr);
 }
 
 bool UIEvent::isUIEvent() const
 {
     return true;
 }
 
 const AtomicString& UIEvent::interfaceName() const
 {
     return EventNames::UIEvent;
@@ skipping 35 matching lines @@
 }
 
 DEFINE_TRACE(UIEvent)
 {
     visitor->trace(m_view);
     visitor->trace(m_sourceDevice);
     Event::trace(visitor);
 }
 
 } // namespace blink