Schedule sibling invalidation sets for sibling insert/remove.

third_party/WebKit/Source/core/css/invalidation/InvalidationSet.h

 /*
  * 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 177 matching lines @@
 class CORE_EXPORT SiblingInvalidationSet final : public InvalidationSet {
 public:
     static PassRefPtr<SiblingInvalidationSet> create(PassRefPtr<DescendantInvalidationSet> descendants)
     {
         return adoptRef(new SiblingInvalidationSet(descendants));
     }
 
     unsigned maxDirectAdjacentSelectors() const { return m_maxDirectAdjacentSelectors; }
     void updateMaxDirectAdjacentSelectors(unsigned value) { m_maxDirectAdjacentSelectors = std::max(value, m_maxDirectAdjacentSelectors); }
 
-    const DescendantInvalidationSet* siblingDescendants() const { return m_siblingDescendantInvalidationSet.get(); }
+    DescendantInvalidationSet* siblingDescendants() const { return m_siblingDescendantInvalidationSet.get(); }
     DescendantInvalidationSet& ensureSiblingDescendants();
 
     DescendantInvalidationSet* descendants() const { return m_descendantInvalidationSet.get(); }
     DescendantInvalidationSet& ensureDescendants();
 
 private:
     explicit SiblingInvalidationSet(PassRefPtr<DescendantInvalidationSet> descendants);
 
     // Indicates the maximum possible number of siblings affected.
     unsigned m_maxDirectAdjacentSelectors;
@@ skipping 12 matching lines @@
     InvalidationSetVector descendants;
     InvalidationSetVector siblings;
 };
 
 DEFINE_TYPE_CASTS(DescendantInvalidationSet, InvalidationSet, value, value->isDescendantInvalidationSet(), value.isDescendantInvalidationSet());
 DEFINE_TYPE_CASTS(SiblingInvalidationSet, InvalidationSet, value, value->isSiblingInvalidationSet(), value.isSiblingInvalidationSet());
 
 } // namespace blink
 
 #endif // InvalidationSet_h