Custom pseudo element types as an invalidation set feature.

Source/core/css/invalidation/StyleInvalidator.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef StyleInvalidator_h
 #define StyleInvalidator_h
 
 #include "core/css/RuleFeature.h"
 #include "heap/Heap.h"
 
 namespace WebCore {
 
 class StyleInvalidator {
     STACK_ALLOCATED();
 public:
     explicit StyleInvalidator(Document&);
     void invalidate();
 
 private:
     bool invalidate(Element&);
     bool invalidateChildren(Element&);
 
     bool checkInvalidationSetsAgainstElement(Element&);
 
     struct RecursionData {
-        RecursionData() : m_foundInvalidationSet(false) { }
+        RecursionData()
+            : m_foundInvalidationSet(false)
+            , m_invalidateCustomPseudo(false)
+        { }
         void pushInvalidationSet(const DescendantInvalidationSet&);
         bool matchesCurrentInvalidationSets(Element&);
         bool foundInvalidationSet() { return m_foundInvalidationSet; }
 
         Vector<AtomicString> m_invalidationClasses;
         Vector<AtomicString> m_invalidationAttributes;
         bool m_foundInvalidationSet;
+        bool m_invalidateCustomPseudo;
     };
 
     class RecursionCheckpoint {
     public:
         RecursionCheckpoint(RecursionData* data)
             : m_prevClassLength(data->m_invalidationClasses.size()),
             m_prevAttributeLength(data->m_invalidationAttributes.size()),
             m_prevFoundInvalidationSet(data->m_foundInvalidationSet),
+            m_prevInvalidateCustomPseudo(data->m_invalidateCustomPseudo),
             m_data(data)
         { }
         ~RecursionCheckpoint()
         {
             m_data->m_invalidationClasses.remove(m_prevClassLength, m_data->m_invalidationClasses.size() - m_prevClassLength);
             m_data->m_invalidationAttributes.remove(m_prevAttributeLength, m_data->m_invalidationAttributes.size() - m_prevAttributeLength);
             m_data->m_foundInvalidationSet = m_prevFoundInvalidationSet;
+            m_data->m_invalidateCustomPseudo = m_prevInvalidateCustomPseudo;
         }
 
     private:
         int m_prevClassLength;
         int m_prevAttributeLength;
         bool m_prevFoundInvalidationSet;
+        bool m_prevInvalidateCustomPseudo;
         RecursionData* m_data;
     };
 
     Document& m_document;
     RuleFeatureSet::PendingInvalidationMap& m_pendingInvalidationMap;
     RecursionData m_recursionData;
 };
 
 } // namespace WebCore
 
 #endif // StyleInvalidator_h