Keep track of accessibility focus across windows.

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

 /*
 * Copyright (C) 2008 Apple 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 2192 matching lines @@
     if (!isTabItem() || !m_layoutObject)
         return false;
 
     Node* node = m_layoutObject->node();
     if (!node || !node->isElementNode())
         return false;
 
     // The ARIA spec says a tab item can also be selected if it is aria-labeled by a tabpanel
     // that has keyboard focus inside of it, or if a tabpanel in its aria-controls list has KB
     // focus inside of it.
-    AXObject* focusedElement = focusedUIElement();
+    AXObject* focusedElement = axObjectCache().focusedObject();
     if (!focusedElement)
         return false;
 
     WillBeHeapVector<RawPtrWillBeMember<Element>> elements;
     elementsFromAttribute(elements, aria_controlsAttr);
 
     for (const auto& element : elements) {
         AXObject* tabPanel = axObjectCache().getOrCreate(element);
 
         // A tab item should only control tab panels.
@@ skipping 310 matching lines @@
         if (label && label->layoutObject()) {
             LayoutRect labelRect = axObjectCache().getOrCreate(label)->elementRect();
             result.unite(labelRect);
         }
     }
 
     return result;
 }
 
 } // namespace blink