Sibling invalidation sets

Source/core/css/invalidation/InvalidationListData.h

Index: Source/core/css/invalidation/InvalidationListData.h
diff --git a/Source/core/css/invalidation/InvalidationListData.h b/Source/core/css/invalidation/InvalidationListData.h
new file mode 100644
index 0000000000000000000000000000000000000000..a3d3886e59f73600be47aa5ada493a3958133a02
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+++ b/Source/core/css/invalidation/InvalidationListData.h
@@ -0,0 +1,33 @@
+// 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 InvalidationListData_h
+#define InvalidationListData_h
+
+#include "core/css/invalidation/InvalidationData.h"
+
+namespace blink {
+
+class CORE_EXPORT InvalidationListData final : public RefCountedWillBeGarbageCollected<InvalidationListData> {
+    WTF_MAKE_NONCOPYABLE(InvalidationListData);
+public:
+    static PassRefPtrWillBeRawPtr<InvalidationListData> create()
+    {
+        return adoptRefWillBeNoop(new InvalidationListData);
+    }
+
+    DECLARE_TRACE();
+
+    InvalidationSetVector& descendants() { return m_invalidationList[InvalidateDescendants]; }
+    InvalidationSetVector& siblings() { return m_invalidationList[InvalidateSiblings]; }
+
+private:
+    InvalidationListData() {}
+
+    InvalidationSetVector m_invalidationList[InvalidateTypeCount];
+};
+
+} // namespace blink
+
+#endif // InvalidationListData_h