Prevent default actions for JS-generated mouse events other than click

Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 2042 matching lines @@
     dispatchScopedEventDispatchMediator(EventDispatchMediator::create(event));
 }
 
 void Node::dispatchScopedEventDispatchMediator(PassRefPtrWillBeRawPtr<EventDispatchMediator> eventDispatchMediator)
 {
     EventDispatcher::dispatchScopedEvent(*this, eventDispatchMediator);
 }
 
 bool Node::dispatchEvent(PassRefPtrWillBeRawPtr<Event> event)
 {
-    if (event->isMouseEvent())
-        return EventDispatcher::dispatchEvent(*this, MouseEventDispatchMediator::create(static_pointer_cast<MouseEvent>(event), MouseEventDispatchMediator::SyntheticMouseEvent));
+    if (event->isMouseEvent()) {
+        toMouseEvent(*event).setFromScript();
+        return EventDispatcher::dispatchEvent(*this, MouseEventDispatchMediator::create(static_pointer_cast<MouseEvent>(event)));
+    }
     if (event->isTouchEvent())
         return dispatchTouchEvent(static_pointer_cast<TouchEvent>(event));
     return EventDispatcher::dispatchEvent(*this, EventDispatchMediator::create(event));
 }
 
 void Node::dispatchSubtreeModifiedEvent()
 {
     if (isInShadowTree())
         return;
 
@@ skipping 373 matching lines @@
         node->showTreeForThis();
 }
 
 void showNodePath(const blink::Node* node)
 {
     if (node)
         node->showNodePathForThis();
 }
 
 #endif