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diff --git a/Source/WebCore/animation/AnimationTimeline.h b/Source/WebCore/animation/AnimationTimeline.h
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+++ b/Source/WebCore/animation/AnimationTimeline.h
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+/*
+ * Copyright (C) Canon Inc. 2016
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted, provided that the following conditions
+ * are required to be 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.
+ * 3. Neither the name of Canon Inc. nor the names of
+ * its contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CANON INC. AND ITS CONTRIBUTORS "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 CANON INC. AND ITS 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(WEB_ANIMATIONS)
+
+#include <wtf/RefCounted.h>
+#include <wtf/TypeCasts.h>
+
+namespace WebCore {
+
+class WebAnimation;
+
+class AnimationTimeline : public RefCounted<AnimationTimeline> {
+public:
+    // Override RefCounted's deref() to ensure operator delete is called on
+    // the appropriate subclass type.
+    void deref()
+    {
+        if (derefBase())
+            destroy();
+    }
+    
+    bool isDocumentTimeline() const { return m_classType == DocumentTimelineClass; }
+
+    void attachAnimation(WebAnimation&);
+    void detachAnimation(WebAnimation&);
+
+protected:
+    enum ClassType {
+        DocumentTimelineClass
+    };
+
+    ClassType classType() const { return m_classType; }
+
+    explicit AnimationTimeline(ClassType);
+
+    // NOTE: Intentionally left non-virtual (using static polymorphism).
+    ~AnimationTimeline();
+
+private:
+    ClassType m_classType;
+
+    void destroy();
+};
+
+} // namespace WebCore
+
+#define SPECIALIZE_TYPE_TRAITS_ANIMATION_TIMELINE(ToValueTypeName, predicate) \
+SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::ToValueTypeName) \
+static bool isType(const WebCore::AnimationTimeline& value) { return value.predicate; } \
+SPECIALIZE_TYPE_TRAITS_END()
+
+#endif // ENABLE(WEB_ANIMATIONS)