Sibling invalidation sets

Source/core/css/invalidation/InvalidationData.h

Index: Source/core/css/invalidation/InvalidationData.h
diff --git a/Source/core/css/invalidation/InvalidationData.h b/Source/core/css/invalidation/InvalidationData.h
new file mode 100644
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+++ b/Source/core/css/invalidation/InvalidationData.h
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+// 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/DescendantInvalidationSet.h"
+
+namespace blink {
+
+enum InvalidateType {
+    InvalidateDescendants = 0,
+    InvalidateSiblings = 1,
+    InvalidateTypeCount = 2
+};
+
+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<DescendantInvalidationSet> descendants() { return m_invalidationSet[InvalidateDescendants]; }
+    PassRefPtrWillBeRawPtr<DescendantInvalidationSet> siblings() { return m_invalidationSet[InvalidateSiblings]; }
+
+    const DescendantInvalidationSet* descendants() const { return m_invalidationSet[InvalidateDescendants].get(); }
+    const DescendantInvalidationSet* siblings() const { return m_invalidationSet[InvalidateSiblings].get(); }
+
+    PassRefPtrWillBeRawPtr<DescendantInvalidationSet> select(InvalidateType type) { return m_invalidationSet[type]; }
+
+    DescendantInvalidationSet& ensureInvalidationSet(InvalidateType);
+
+    DECLARE_TRACE();
+
+private:
+    InvalidationData() {}
+
+    RefPtrWillBeMember<DescendantInvalidationSet> m_invalidationSet[InvalidateTypeCount];
+};
+
+} // namespace blink
+
+#endif // InvalidationData_h