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diff --git a/Source/WebCore/page/PageOverlayController.h b/Source/WebCore/page/PageOverlayController.h
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+++ b/Source/WebCore/page/PageOverlayController.h
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+/*
+ * Copyright (C) 2014 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 "GraphicsLayerClient.h"
+#include "PageOverlay.h"
+#include <wtf/HashMap.h>
+#include <wtf/RefPtr.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+class Frame;
+class MainFrame;
+class Page;
+class PlatformMouseEvent;
+
+class PageOverlayController final : public GraphicsLayerClient {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    PageOverlayController(MainFrame&);
+    virtual ~PageOverlayController();
+
+    GraphicsLayer& layerWithDocumentOverlays();
+    GraphicsLayer& layerWithViewOverlays();
+
+    WEBCORE_EXPORT GraphicsLayer* documentOverlayRootLayer() const;
+    WEBCORE_EXPORT GraphicsLayer* viewOverlayRootLayer() const;
+
+    const Vector<RefPtr<PageOverlay>>& pageOverlays() const { return m_pageOverlays; }
+
+    WEBCORE_EXPORT void installPageOverlay(PageOverlay&, PageOverlay::FadeMode);
+    WEBCORE_EXPORT void uninstallPageOverlay(PageOverlay&, PageOverlay::FadeMode);
+
+    void setPageOverlayNeedsDisplay(PageOverlay&, const IntRect&);
+    void setPageOverlayOpacity(PageOverlay&, float);
+    void clearPageOverlay(PageOverlay&);
+    GraphicsLayer& layerForOverlay(PageOverlay&) const;
+
+    void willDetachRootLayer();
+
+    void didChangeViewSize();
+    void didChangeDocumentSize();
+    void didChangeSettings();
+    void didChangeDeviceScaleFactor();
+    void didChangeViewExposedRect();
+    void didScrollFrame(Frame&);
+
+    void didChangeOverlayFrame(PageOverlay&);
+    void didChangeOverlayBackgroundColor(PageOverlay&);
+
+    int overlayCount() const { return m_overlayGraphicsLayers.size(); }
+
+    bool handleMouseEvent(const PlatformMouseEvent&);
+
+    WEBCORE_EXPORT bool copyAccessibilityAttributeStringValueForPoint(String attribute, FloatPoint, String& value);
+    WEBCORE_EXPORT bool copyAccessibilityAttributeBoolValueForPoint(String attribute, FloatPoint, bool& value);
+    WEBCORE_EXPORT Vector<String> copyAccessibilityAttributesNames(bool parameterizedNames);
+
+private:
+    void createRootLayersIfNeeded();
+
+    void updateSettingsForLayer(GraphicsLayer&);
+    void updateForceSynchronousScrollLayerPositionUpdates();
+
+    // GraphicsLayerClient
+    void notifyFlushRequired(const GraphicsLayer*) override;
+    void paintContents(const GraphicsLayer*, GraphicsContext&, GraphicsLayerPaintingPhase, const FloatRect& clipRect) override;
+    float deviceScaleFactor() const override;
+    bool shouldSkipLayerInDump(const GraphicsLayer*, LayerTreeAsTextBehavior) const override;
+    void tiledBackingUsageChanged(const GraphicsLayer*, bool) override;
+
+    std::unique_ptr<GraphicsLayer> m_documentOverlayRootLayer;
+    std::unique_ptr<GraphicsLayer> m_viewOverlayRootLayer;
+    bool m_initialized;
+
+    HashMap<PageOverlay*, std::unique_ptr<GraphicsLayer>> m_overlayGraphicsLayers;
+    Vector<RefPtr<PageOverlay>> m_pageOverlays;
+    MainFrame& m_mainFrame;
+};
+
+} // namespace WebKit