Sibling invalidation sets

Source/core/css/invalidation/PendingInvalidations.h

Index: Source/core/css/invalidation/PendingInvalidations.h
diff --git a/Source/core/css/invalidation/PendingInvalidations.h b/Source/core/css/invalidation/PendingInvalidations.h
new file mode 100644
index 0000000000000000000000000000000000000000..897fd3b4e65e0a3377ffcf7fe5e36346851b8fa0
--- /dev/null
+++ b/Source/core/css/invalidation/PendingInvalidations.h
@@ -0,0 +1,42 @@
+// 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 PendingInvalidations_h
+#define PendingInvalidations_h
+
+#include "core/css/invalidation/InvalidationSet.h"
+
+namespace blink {
+
+class CORE_EXPORT PendingInvalidations final : public RefCountedWillBeGarbageCollected<PendingInvalidations> {
+    WTF_MAKE_NONCOPYABLE(PendingInvalidations);
+public:
+    static PassRefPtrWillBeRawPtr<PendingInvalidations> create()
+    {
+        return adoptRefWillBeNoop(new PendingInvalidations);
+    }
+
+    InvalidationSetVector& descendants() { return m_descendants; }
+    const InvalidationSetVector& descendants() const { return m_descendants; }
+    InvalidationSetVector& siblings() { return m_siblings; }
+    const InvalidationSetVector& siblings() const { return m_siblings; }
+
+    DEFINE_INLINE_TRACE()
+    {
+#if ENABLE(OILPAN)
+        visitor->trace(m_descendants);
+        visitor->trace(m_siblings);
+#endif
+    }
+
+private:
+    PendingInvalidations() {}
+
+    InvalidationSetVector m_descendants;
+    InvalidationSetVector m_siblings;
+};
+
+} // namespace blink
+
+#endif // PendingInvalidations_h