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diff --git a/Source/WebCore/css/CSSAnimationTriggerScrollValue.h b/Source/WebCore/css/CSSAnimationTriggerScrollValue.h
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+++ b/Source/WebCore/css/CSSAnimationTriggerScrollValue.h
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+/*
+ * Copyright (C) 2015 Apple 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#if ENABLE(CSS_ANIMATIONS_LEVEL_2)
+
+#include "CSSValue.h"
+
+namespace WebCore {
+
+class CSSAnimationTriggerScrollValue final : public CSSValue {
+public:
+    static Ref<CSSAnimationTriggerScrollValue> create(Ref<CSSValue>&& startValue, RefPtr<CSSValue>&& endValue = nullptr)
+    {
+        return adoptRef(*new CSSAnimationTriggerScrollValue(WTFMove(startValue), WTFMove(endValue)));
+    }
+
+    const CSSValue& startValue() const { return m_startValue.get(); }
+    const CSSValue* endValue() const { return m_endValue.get(); }
+    bool hasEndValue() const { return m_endValue; }
+
+    String customCSSText() const;
+
+    bool equals(const CSSAnimationTriggerScrollValue&) const;
+    bool operator==(const CSSAnimationTriggerScrollValue& other) const { return equals(other); }
+
+private:
+    CSSAnimationTriggerScrollValue(Ref<CSSValue>&& startValue, RefPtr<CSSValue>&& endValue)
+        : CSSValue(AnimationTriggerScrollClass)
+        , m_startValue(WTFMove(startValue))
+        , m_endValue(WTFMove(endValue))
+    {
+    }
+
+    Ref<CSSValue> m_startValue;
+    RefPtr<CSSValue> m_endValue;
+};
+
+}
+
+SPECIALIZE_TYPE_TRAITS_CSS_VALUE(CSSAnimationTriggerScrollValue, isAnimationTriggerScrollValue())
+
+#endif