Custom pseudo element types as an invalidation set feature.

Source/core/css/invalidation/DescendantInvalidationSet.cpp

 /*
  * Copyright (C) 2014 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 20 matching lines @@
 #include "config.h"
 #include "core/css/invalidation/DescendantInvalidationSet.h"
 
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Element.h"
 
 namespace WebCore {
 
 DescendantInvalidationSet::DescendantInvalidationSet()
     : m_allDescendantsMightBeInvalid(false)
+    , m_customPseudoInvalid(false)
 {
 }
 
 void DescendantInvalidationSet::combine(const DescendantInvalidationSet& other)
 {
     // No longer bother combining data structures, since the whole subtree is deemed invalid.
     if (wholeSubtreeInvalid())
         return;
 
     if (other.wholeSubtreeInvalid()) {
         setWholeSubtreeInvalid();
         return;
     }
 
+    if (other.customPseudoInvalid())
+        setCustomPseudoInvalid();
+
     if (other.m_classes) {
         HashSet<AtomicString>::const_iterator end = other.m_classes->end();
         for (HashSet<AtomicString>::const_iterator it = other.m_classes->begin(); it != end; ++it)
             addClass(*it);
     }
 
     if (other.m_ids) {
         HashSet<AtomicString>::const_iterator end = other.m_ids->end();
         for (HashSet<AtomicString>::const_iterator it = other.m_ids->begin(); it != end; ++it)
             addId(*it);
@@ skipping 90 matching lines @@
         return;
 
     m_allDescendantsMightBeInvalid = true;
     m_classes = nullptr;
     m_ids = nullptr;
     m_tagNames = nullptr;
     m_attributes = nullptr;
 }
 
 } // namespace WebCore