Make slots in non-shadow trees participate in a flat tree

third_party/WebKit/Source/core/dom/LayoutTreeBuilder.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 30 matching lines @@
 #include "core/layout/LayoutText.h"
 #include "core/layout/LayoutView.h"
 #include "core/svg/SVGElement.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
 namespace blink {
 
 LayoutTreeBuilderForElement::LayoutTreeBuilderForElement(Element& element,
                                                          ComputedStyle* style)
     : LayoutTreeBuilder(element, nullptr), m_style(style) {
-  DCHECK(!element.isSlotOrActiveInsertionPoint());
+  DCHECK(!element.isActiveSlotOrActiveInsertionPoint());
   if (element.isFirstLetterPseudoElement()) {
     if (LayoutObject* nextLayoutObject =
             FirstLetterPseudoElement::firstLetterTextLayoutObject(element))
       m_layoutObjectParent = nextLayoutObject->parent();
   } else if (ContainerNode* containerNode =
                  LayoutTreeBuilderTraversal::parent(element)) {
     m_layoutObjectParent = containerNode->layoutObject();
   }
 }
 
@@ skipping 112 matching lines @@
       m_layoutObjectParent->isInsideFlowThread());
 
   LayoutObject* nextLayoutObject = this->nextLayoutObject();
   m_node->setLayoutObject(newLayoutObject);
   // Parent takes care of the animations, no need to call setAnimatableStyle.
   newLayoutObject->setStyle(&style);
   m_layoutObjectParent->addChild(newLayoutObject, nextLayoutObject);
 }
 
 }  // namespace blink