Send AXLayoutComplete even when document hasn't finished loading yet (reland)

Source/core/accessibility/AXObjectCache.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010, 2011 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 114 matching lines @@
 
     void handleActiveDescendantChanged(Node*);
     void handleAriaRoleChanged(Node*);
     void handleFocusedUIElementChanged(Node* oldFocusedNode, Node* newFocusedNode);
     void handleScrolledToAnchor(const Node* anchorNode);
     void handleAriaExpandedChange(Node*);
 
     // Called when scroll bars are added / removed (as the view resizes).
     void handleScrollbarUpdate(ScrollView*);
 
+    void handleLayoutComplete(RenderObject*);
+
     // Called when the scroll offset changes.
     void handleScrollPositionChanged(ScrollView*);
     void handleScrollPositionChanged(RenderObject*);
 
     void handleAttributeChanged(const QualifiedName& attrName, Element*);
     void recomputeIsIgnored(RenderObject* renderer);
 
     static void enableAccessibility() { gAccessibilityEnabled = true; }
     static bool accessibilityEnabled() { return gAccessibilityEnabled; }
     static void setInlineTextBoxAccessibility(bool flag) { gInlineTextBoxAccessibility = flag; }
@@ skipping 88 matching lines @@
     AXID getAXID(AXObject*);
 };
 
 bool nodeHasRole(Node*, const String& role);
 // This will let you know if aria-hidden was explicitly set to false.
 bool isNodeAriaVisible(Node*);
 
 }
 
 #endif