Try needsPaintInvalidationLayer() && !hasLayer()

third_party/WebKit/Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1823 matching lines @@
     // style changing, since it depends on whether we decide to composite these elements. When the
     // layer status of one of these elements changes, we need to force a layout.
     if (!diff.needsFullLayout() && style() && isBoxModelObject()) {
         bool requiresLayer = toLayoutBoxModelObject(this)->layerTypeRequired() != NoPaintLayer;
         if (hasLayer() != requiresLayer)
             diff.setNeedsFullLayout();
     }
 
     // If we have no layer(), just treat a PaintInvalidationLayer hint as a normal paint invalidation.
     if (diff.needsPaintInvalidationLayer() && !hasLayer()) {
+        ASSERT_NOT_REACHED();
         diff.clearNeedsPaintInvalidation();
         diff.setNeedsPaintInvalidationObject();
     }
 
     return diff;
 }
 
 void LayoutObject::setPseudoStyle(PassRefPtr<ComputedStyle> pseudoStyle)
 {
     ASSERT(pseudoStyle->styleType() == PseudoIdBefore || pseudoStyle->styleType() == PseudoIdAfter || pseudoStyle->styleType() == PseudoIdFirstLetter);
@@ skipping 1845 matching lines @@
         const blink::LayoutObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
     } else {
         fprintf(stderr, "Cannot showLayoutTree. Root is (nil)\n");
     }
 }
 
 #endif