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diff --git a/Source/WebCore/style/RenderTreeUpdater.h b/Source/WebCore/style/RenderTreeUpdater.h
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+++ b/Source/WebCore/style/RenderTreeUpdater.h
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+/*
+ * Copyright (C) 2016 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. 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 APPLE INC. OR 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
+
+#include "RenderTreePosition.h"
+#include "StyleChange.h"
+#include "StyleUpdate.h"
+#include <wtf/HashMap.h>
+#include <wtf/HashSet.h>
+#include <wtf/RefPtr.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+class ContainerNode;
+class Document;
+class Element;
+class Node;
+class RenderStyle;
+class Text;
+
+class RenderTreeUpdater {
+public:
+    RenderTreeUpdater(Document&);
+
+    void commit(std::unique_ptr<const Style::Update>);
+
+    enum class TeardownType { Normal, KeepHoverAndActive };
+    static void tearDownRenderers(Element&, TeardownType = TeardownType::Normal);
+    static void tearDownRenderer(Text&);
+
+private:
+    void updateRenderTree(ContainerNode& root);
+    void updateTextRenderer(Text&);
+    void updateElementRenderer(Element&, const Style::ElementUpdate&);
+    void createRenderer(Element&, RenderStyle&&);
+    void invalidateWhitespaceOnlyTextSiblingsAfterAttachIfNeeded(Node&);
+    void updateBeforeOrAfterPseudoElement(Element&, PseudoId);
+
+    struct Parent {
+        Element* element { nullptr };
+        Style::Change styleChange { Style::NoChange };
+        std::optional<RenderTreePosition> renderTreePosition;
+
+        Parent(ContainerNode& root);
+        Parent(Element&, Style::Change);
+    };
+    Parent& parent() { return m_parentStack.last(); }
+    RenderTreePosition& renderTreePosition();
+
+    void pushParent(Element&, Style::Change);
+    void popParent();
+    void popParentsToDepth(unsigned depth);
+
+    Document& m_document;
+    std::unique_ptr<const Style::Update> m_styleUpdate;
+
+    Vector<Parent> m_parentStack;
+
+    HashSet<Text*> m_invalidatedWhitespaceOnlyTextSiblings;
+};
+
+} // namespace WebCore