Skip child ShadowRoots when invalidation does not have boundary crossing rules

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 "platform/heap/Handle.h"
 
 namespace WebCore {
@@ skipping 20 matching lines @@
 private:
     bool invalidate(Element&);
     bool invalidateChildren(Element&);
 
     bool checkInvalidationSetsAgainstElement(Element&);
 
     struct RecursionData {
         RecursionData()
             : m_invalidateCustomPseudo(false)
             , m_wholeSubtreeInvalid(false)
+            , m_treeBoundaryCrossing(false)
         { }
+
         void pushInvalidationSet(const DescendantInvalidationSet&);
         bool matchesCurrentInvalidationSets(Element&);
         bool hasInvalidationSets() const { return m_invalidationSets.size(); }
+
         bool wholeSubtreeInvalid() const { return m_wholeSubtreeInvalid; }
         void setWholeSubtreeInvalid() { m_wholeSubtreeInvalid = true; }
 
+        bool treeBoundaryCrossing() const { return m_treeBoundaryCrossing; }
+
         typedef Vector<const DescendantInvalidationSet*, 16> InvalidationSets;
         InvalidationSets m_invalidationSets;
         bool m_invalidateCustomPseudo;
         bool m_wholeSubtreeInvalid;
+        bool m_treeBoundaryCrossing;
     };
 
     class RecursionCheckpoint {
     public:
         RecursionCheckpoint(RecursionData* data)
             : m_prevInvalidationSetsSize(data->m_invalidationSets.size())
             , m_prevInvalidateCustomPseudo(data->m_invalidateCustomPseudo)
             , m_prevWholeSubtreeInvalid(data->m_wholeSubtreeInvalid)
+            , m_treeBoundaryCrossing(data->m_treeBoundaryCrossing)
             , m_data(data)
         { }
         ~RecursionCheckpoint()
         {
             m_data->m_invalidationSets.remove(m_prevInvalidationSetsSize, m_data->m_invalidationSets.size() - m_prevInvalidationSetsSize);
             m_data->m_invalidateCustomPseudo = m_prevInvalidateCustomPseudo;
             m_data->m_wholeSubtreeInvalid = m_prevWholeSubtreeInvalid;
+            m_data->m_treeBoundaryCrossing = m_treeBoundaryCrossing;
         }
 
     private:
         int m_prevInvalidationSetsSize;
         bool m_prevInvalidateCustomPseudo;
         bool m_prevWholeSubtreeInvalid;
+        bool m_treeBoundaryCrossing;
         RecursionData* m_data;
     };
 
     typedef WillBeHeapVector<RefPtrWillBeMember<DescendantInvalidationSet> > InvalidationList;
     typedef WillBeHeapHashMap<RawPtrWillBeMember<Element>, OwnPtrWillBeMember<InvalidationList> > PendingInvalidationMap;
 
     InvalidationList& ensurePendingInvalidationList(Element&);
 
     PendingInvalidationMap m_pendingInvalidationMap;
     RecursionData m_recursionData;
 };
 
 } // namespace WebCore
 
 #endif // StyleInvalidator_h