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

Source/core/accessibility/AXObjectCache.cpp

 /*
  * Copyright (C) 2008, 2009, 2010 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 786 matching lines @@
     if (!view)
         return;
 
     // We don't want to create a scroll view from this method, only update an existing one.
     if (AXObject* scrollViewObject = get(view)) {
         m_computedObjectAttributeCache->clear();
         scrollViewObject->updateChildrenIfNecessary();
     }
 }
 
+void AXObjectCache::handleLayoutComplete(RenderObject* renderer)
+{
+    if (!renderer)
+        return;
+
+    m_computedObjectAttributeCache->clear();
+
+    // Create the AXObject if it didn't yet exist - that's always safe at the end of a layout, and it
+    // allows an AX notification to be sent when a page has its first layout, rather than when the

[eseidel, 2014/03/17 15:41:31]

The document may be styled by the UA stylesheet at this point and may be very
far from it's eventual styles/renderer types.

+    // document first loads.
+    if (AXObject* obj = getOrCreate(renderer))
+        postNotification(obj, obj->document(), AXLayoutComplete, true);
+}
+
 void AXObjectCache::handleAriaExpandedChange(Node* node)
 {
     if (AXObject* obj = getOrCreate(node))
         obj->handleAriaExpandedChanged();
 }
 
 void AXObjectCache::handleActiveDescendantChanged(Node* node)
 {
     if (AXObject* obj = getOrCreate(node))
         obj->handleActiveDescendantChanged();
@@ skipping 217 matching lines @@
 {
     postPlatformNotification(getOrCreate(scrollView), AXScrollPositionChanged);
 }
 
 void AXObjectCache::handleScrollPositionChanged(RenderObject* renderObject)
 {
     postPlatformNotification(getOrCreate(renderObject), AXScrollPositionChanged);
 }
 
 } // namespace WebCore