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diff --git a/Source/WebKit2/WebProcess/WebPage/AcceleratedDrawingArea.h b/Source/WebKit2/WebProcess/WebPage/AcceleratedDrawingArea.h
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+++ b/Source/WebKit2/WebProcess/WebPage/AcceleratedDrawingArea.h
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+/*
+ * Copyright (C) 2011 Apple Inc. All rights reserved.
+ * Copyright (C) 2013 Nokia Corporation and/or its subsidiary(-ies).
+ *
+ * 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 "DrawingArea.h"
+#include <wtf/RunLoop.h>
+
+namespace WebKit {
+
+class LayerTreeHost;
+
+class AcceleratedDrawingArea : public DrawingArea {
+public:
+    AcceleratedDrawingArea(WebPage&, const WebPageCreationParameters&);
+    virtual ~AcceleratedDrawingArea();
+
+protected:
+    // DrawingArea
+    void setNeedsDisplay() override;
+    void setNeedsDisplayInRect(const WebCore::IntRect&) override;
+    void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollDelta) override;
+    void pageBackgroundTransparencyChanged() override;
+    void setLayerTreeStateIsFrozen(bool) override;
+    bool layerTreeStateIsFrozen() const override { return m_layerTreeStateIsFrozen; }
+    LayerTreeHost* layerTreeHost() const override { return m_layerTreeHost.get(); }
+    void forceRepaint() override;
+    bool forceRepaintAsync(uint64_t callbackID) override;
+
+    void setPaintingEnabled(bool) override;
+    void updatePreferences(const WebPreferencesStore&) override;
+    void mainFrameContentSizeChanged(const WebCore::IntSize&) override;
+
+    WebCore::GraphicsLayerFactory* graphicsLayerFactory() override;
+    void setRootCompositingLayer(WebCore::GraphicsLayer*) override;
+    void scheduleCompositingLayerFlush() override;
+    void scheduleCompositingLayerFlushImmediately() override;
+
+#if USE(TEXTURE_MAPPER_GL) && PLATFORM(GTK) && PLATFORM(X11) && !USE(REDIRECTED_XCOMPOSITE_WINDOW)
+    void setNativeSurfaceHandleForCompositing(uint64_t) override;
+    void destroyNativeSurfaceHandleForCompositing(bool&) override;
+#endif
+
+    void activityStateDidChange(WebCore::ActivityState::Flags, bool /* wantsDidUpdateActivityState */, const Vector<uint64_t>& /* callbackIDs */) override;
+    void attachViewOverlayGraphicsLayer(WebCore::Frame*, WebCore::GraphicsLayer*) override;
+
+    void layerHostDidFlushLayers() override;
+
+#if USE(COORDINATED_GRAPHICS_THREADED)
+    void didChangeViewportAttributes(WebCore::ViewportAttributes&&) override;
+#endif
+
+#if USE(COORDINATED_GRAPHICS) || USE(TEXTURE_MAPPER)
+    void deviceOrPageScaleFactorChanged() override;
+#endif
+
+    // IPC message handlers.
+    void updateBackingStoreState(uint64_t backingStoreStateID, bool respondImmediately, float deviceScaleFactor, const WebCore::IntSize&, const WebCore::IntSize& scrollOffset) override;
+
+    void exitAcceleratedCompositingModeSoon();
+    bool exitAcceleratedCompositingModePending() const { return m_exitCompositingTimer.isActive(); }
+    void exitAcceleratedCompositingModeNow();
+    void discardPreviousLayerTreeHost();
+
+    virtual void suspendPainting();
+    virtual void resumePainting();
+
+    virtual void sendDidUpdateBackingStoreState();
+    virtual void didUpdateBackingStoreState() { }
+
+    virtual void enterAcceleratedCompositingMode(WebCore::GraphicsLayer*);
+    virtual void exitAcceleratedCompositingMode() { }
+
+    uint64_t m_backingStoreStateID { 0 };
+
+    // Whether painting is enabled. If painting is disabled, any calls to setNeedsDisplay and scroll are ignored.
+    bool m_isPaintingEnabled { true };
+
+    // Whether we're currently processing an UpdateBackingStoreState message.
+    bool m_inUpdateBackingStoreState { false };
+
+    // When true, we should send an UpdateBackingStoreState message instead of any other messages
+    // we normally send to the UI process.
+    bool m_shouldSendDidUpdateBackingStoreState { false };
+
+    // True between sending the 'enter compositing' messages, and the 'exit compositing' message.
+    bool m_compositingAccordingToProxyMessages { false };
+
+    // When true, we maintain the layer tree in its current state by not leaving accelerated compositing mode
+    // and not scheduling layer flushes.
+    bool m_layerTreeStateIsFrozen { false };
+
+    // True when we were asked to exit accelerated compositing mode but couldn't because layer tree
+    // state was frozen.
+    bool m_wantsToExitAcceleratedCompositingMode { false };
+
+    // Whether painting is suspended. We'll still keep track of the dirty region but we
+    // won't paint until painting has resumed again.
+    bool m_isPaintingSuspended { false };
+
+    RunLoop::Timer<AcceleratedDrawingArea> m_exitCompositingTimer;
+
+    // The layer tree host that handles accelerated compositing.
+    RefPtr<LayerTreeHost> m_layerTreeHost;
+
+    RefPtr<LayerTreeHost> m_previousLayerTreeHost;
+    RunLoop::Timer<AcceleratedDrawingArea> m_discardPreviousLayerTreeHostTimer;
+};
+
+} // namespace WebKit