Rewrite Shadow DOM distribution engine to support partial synchronous distribution for v1

third_party/WebKit/Source/core/dom/shadow/ElementShadow.cpp

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 236 matching lines @@
         root = root->olderShadowRoot();
         otherRoot = otherRoot->olderShadowRoot();
     }
 
     return true;
 }
 
 const InsertionPoint* ElementShadow::finalDestinationInsertionPointFor(const Node* key) const
 {
     DCHECK(key);
-#if DCHECK_IS_ON()
     DCHECK(!key->needsDistributionRecalc());
-#endif
     NodeToDestinationInsertionPoints::const_iterator it = m_nodeToInsertionPoints.find(key);
     return it == m_nodeToInsertionPoints.end() ? nullptr : it->value->last();
 }
 
 const DestinationInsertionPoints* ElementShadow::destinationInsertionPointsFor(const Node* key) const
 {
     DCHECK(key);
-#if DCHECK_IS_ON()
     DCHECK(!key->needsDistributionRecalc());
-#endif
     NodeToDestinationInsertionPoints::const_iterator it = m_nodeToInsertionPoints.find(key);
     return it == m_nodeToInsertionPoints.end() ? nullptr : it->value;
 }
 
 void ElementShadow::distribute()
 {
     if (isV1())
         youngestShadowRoot().distributeV1();
     else
         distributeV0();
@@ skipping 101 matching lines @@
     visitor->trace(m_selectFeatures);
     visitor->trace(m_shadowRoot);
 }
 
 DEFINE_TRACE_WRAPPERS(ElementShadow)
 {
     visitor->traceWrappers(m_shadowRoot);
 }
 
 } // namespace blink