[CSS Regions] Add new regionOversetChange event

Source/core/dom/NamedFlow.cpp

 /*
  * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
  *
  * 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 notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 85 matching lines @@
 
     if (!m_parentFlowThread)
         return -1;
 
     const RenderRegionList& regionList = m_parentFlowThread->renderRegionList();
     if (regionList.isEmpty())
         return -1;
     RenderRegionList::const_iterator iter = regionList.begin();
     for (int index = 0; iter != regionList.end(); ++index, ++iter) {
         const RenderRegion* renderRegion = *iter;
-        if (renderRegion->regionState() == RenderRegion::RegionEmpty)
+        if (renderRegion->regionOversetState() == RegionEmpty)
             return index;
     }
     return -1;
 }
 
 PassRefPtr<NodeList> NamedFlow::getRegionsByContent(Node* contentNode)
 {
     Vector<RefPtr<Node> > regionNodes;
 
     if (!contentNode)
@@ skipping 93 matching lines @@
 
     // If the flow is in the "NULL" state the event should not be dispatched any more.
     if (flowState() == FlowStateNull)
         return;
 
     RefPtr<Event> event = UIEvent::create(eventNames().webkitregionlayoutupdateEvent, false, false, m_flowManager->document()->defaultView(), 0);
 
     dispatchEvent(event);
 }
 
+void NamedFlow::dispatchRegionOversetChangeEvent()
+{
+    ASSERT(!NoEventDispatchAssertion::isEventDispatchForbidden());
+
+    // If the flow is in the "NULL" state the event should not be dispatched any more.
+    if (flowState() == FlowStateNull)
+        return;
+
+    RefPtr<Event> event = UIEvent::create(eventNames().webkitregionoversetchangeEvent, false, false, m_flowManager->document()->defaultView(), 0);
+
+    dispatchEvent(event);
+}
+
 const AtomicString& NamedFlow::interfaceName() const
 {
     return eventNames().interfaceForNamedFlow;
 }
 
 ScriptExecutionContext* NamedFlow::scriptExecutionContext() const
 {
     return m_flowManager->document();
 }
 
 Node* NamedFlow::ownerNode() const
 {
     return m_flowManager->document();
 }
 
 } // namespace WebCore