OnChange event should fire if the multiple selection changes in listbox using mouse

Source/core/page/AutoscrollController.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 18 matching lines @@
 #include "config.h"
 #include "core/page/AutoscrollController.h"
 
 #include "core/page/EventHandler.h"
 #include "core/frame/Frame.h"
 #include "core/frame/FrameView.h"
 #include "core/page/Chrome.h"
 #include "core/page/Page.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/RenderBox.h"
+#include "core/rendering/RenderListBox.h"
 #include "wtf/CurrentTime.h"
 
 namespace WebCore {
 
 // Delay time in second for start autoscroll if pointer is in border edge of scrollable element.
 static double autoscrollDelay = 0.2;
 
 PassOwnPtr<AutoscrollController> AutoscrollController::create(Page& page)
 {
     return adoptPtr(new AutoscrollController(page));
@@ skipping 17 matching lines @@
     return m_autoscrollRenderer == renderer;
 }
 
 void AutoscrollController::startAutoscrollForSelection(RenderObject* renderer)
 {
     // We don't want to trigger the autoscroll or the panScroll if it's already active
     if (m_autoscrollType != NoAutoscroll)
         return;
     RenderBox* scrollable = RenderBox::findAutoscrollable(renderer);
     if (!scrollable)
+        scrollable = renderer->isListBox() ? toRenderListBox(renderer) : 0;
+    if (!scrollable)
         return;
     m_autoscrollType = AutoscrollForSelection;
     m_autoscrollRenderer = scrollable;
     startAutoscroll();
 }
 
 void AutoscrollController::stopAutoscroll()
 {
     RenderBox* scrollable = m_autoscrollRenderer;
     m_autoscrollRenderer = 0;
@@ skipping 201 matching lines @@
     } else if (east)
         view->setCursor(eastPanningCursor());
     else if (west)
         view->setCursor(westPanningCursor());
     else
         view->setCursor(middlePanningCursor());
 }
 #endif
 
 } // namespace WebCore