Sibling invalidation sets

Source/core/css/invalidation/InvalidationData.h

+// Copyright 2015 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 InvalidationData_h
+#define InvalidationData_h
+
+#include "core/css/invalidation/InvalidationSet.h"
+
+namespace blink {
+
+enum InvalidationType {
+    InvalidateDescendants,
+    InvalidateSiblings
+};
+
+class CORE_EXPORT InvalidationData final : public RefCountedWillBeGarbageCollected<InvalidationData> {
+    WTF_MAKE_NONCOPYABLE(InvalidationData);
+public:
+    static PassRefPtrWillBeRawPtr<InvalidationData> create()
+    {
+        return adoptRefWillBeNoop(new InvalidationData);
+    }
+
+    void combine(const InvalidationData& other);
+
+    PassRefPtrWillBeRawPtr<InvalidationSet> descendants() { return m_descendants; }
+    PassRefPtrWillBeRawPtr<InvalidationSet> siblings() { return m_siblings; }
+
+    const InvalidationSet* descendants() const { return m_descendants.get(); }
+    const InvalidationSet* siblings() const { return m_siblings.get(); }
+
+    InvalidationSet& ensureInvalidationSet(InvalidationType);
+
+    DECLARE_TRACE();
+
+private:
+    InvalidationData() {}
+
+    RefPtrWillBeMember<InvalidationSet> m_descendants;
+    RefPtrWillBeMember<InvalidationSet> m_siblings;
+};
+
+} // namespace blink
+
+#endif // InvalidationData_h