Keep track of accessibility focus across windows.

third_party/WebKit/Source/modules/accessibility/AXObjectCacheImpl.cpp

 /*
  * Copyright (C) 2014, Google Inc. 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 131 matching lines @@
         if (!child->isImageMapLink())
             continue;
 
         if (toAXImageMapLink(child)->areaElement() == areaElement)
             return child;
     }
 
     return 0;
 }
 
-AXObject* AXObjectCacheImpl::focusedUIElementForPage(const Page* page)
+AXObject* AXObjectCacheImpl::focusedObject()
 {
-    if (!page->settings().accessibilityEnabled())
+    if (!accessibilityEnabled())
         return 0;
 
     // Cross-process accessibility is not yet implemented.
+    Page* page = m_document->page();
     if (!page->focusController().focusedOrMainFrame()->isLocalFrame())
         return 0;
 
     // get the focused node in the page
     Document* focusedDocument = toLocalFrame(page->focusController().focusedOrMainFrame())->document();
     Node* focusedNode = focusedDocument->focusedElement();
     if (!focusedNode)
         focusedNode = focusedDocument;
 
     if (isHTMLAreaElement(*focusedNode))
@@ skipping 939 matching lines @@
 
 void AXObjectCacheImpl::handleFocusedUIElementChanged(Node* oldFocusedNode, Node* newFocusedNode)
 {
     if (!newFocusedNode)
         return;
 
     Page* page = newFocusedNode->document().page();
     if (!page)
         return;
 
-    AXObject* focusedObject = focusedUIElementForPage(page);
+    AXObject* focusedObject = this->focusedObject();
     if (!focusedObject)
         return;
 
     AXObject* oldFocusedObject = get(oldFocusedNode);
 
     postPlatformNotification(oldFocusedObject, AXBlur);
     postPlatformNotification(focusedObject, AXFocusedUIElementChanged);
 }
 
 void AXObjectCacheImpl::handleInitialFocus()
@@ skipping 114 matching lines @@
     visitor->trace(m_nodeObjectMapping);
 #endif
 
     visitor->trace(m_objects);
     visitor->trace(m_notificationsToPost);
 
     AXObjectCache::trace(visitor);
 }
 
 } // namespace blink