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diff --git a/Source/WebKit2/UIProcess/AcceleratedDrawingAreaProxy.h b/Source/WebKit2/UIProcess/AcceleratedDrawingAreaProxy.h
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+++ b/Source/WebKit2/UIProcess/AcceleratedDrawingAreaProxy.h
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+/*
+ * Copyright (C) 2011 Apple Inc. All rights reserved.
+ * Copyright (C) 2013 Nokia Corporation and/or its subsidiary(-ies).
+ * Copyright (C) 2016 Igalia S.L.
+ *
+ * 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 "DrawingAreaProxy.h"
+#include "LayerTreeContext.h"
+
+namespace WebKit {
+
+class AcceleratedDrawingAreaProxy : public DrawingAreaProxy {
+public:
+    explicit AcceleratedDrawingAreaProxy(WebPageProxy&);
+    virtual ~AcceleratedDrawingAreaProxy();
+
+    bool isInAcceleratedCompositingMode() const { return alwaysUseCompositing() || !m_layerTreeContext.isEmpty(); }
+    void visibilityDidChange();
+
+#if USE(TEXTURE_MAPPER_GL) && PLATFORM(GTK) && PLATFORM(X11) && !USE(REDIRECTED_XCOMPOSITE_WINDOW)
+    void setNativeSurfaceHandleForCompositing(uint64_t);
+    void destroyNativeSurfaceHandleForCompositing();
+#endif
+
+    void dispatchAfterEnsuringDrawing(std::function<void(CallbackBase::Error)>) override;
+
+protected:
+    // DrawingAreaProxy
+    void sizeDidChange() override;
+    void deviceScaleFactorDidChange() override;
+    void waitForBackingStoreUpdateOnNextPaint() override;
+
+    // IPC message handlers
+    void didUpdateBackingStoreState(uint64_t backingStoreStateID, const UpdateInfo&, const LayerTreeContext&) override;
+    void enterAcceleratedCompositingMode(uint64_t backingStoreStateID, const LayerTreeContext&) override;
+    void exitAcceleratedCompositingMode(uint64_t backingStoreStateID, const UpdateInfo&) override;
+    void updateAcceleratedCompositingMode(uint64_t backingStoreStateID, const LayerTreeContext&) override;
+
+    enum RespondImmediatelyOrNot { DoNotRespondImmediately, RespondImmediately };
+    void backingStoreStateDidChange(RespondImmediatelyOrNot);
+    void sendUpdateBackingStoreState(RespondImmediatelyOrNot);
+    void waitForAndDispatchDidUpdateBackingStoreState();
+
+    virtual void enterAcceleratedCompositingMode(const LayerTreeContext&);
+    void exitAcceleratedCompositingMode();
+    void updateAcceleratedCompositingMode(const LayerTreeContext&);
+
+    bool alwaysUseCompositing() const;
+
+    // The state ID corresponding to our current backing store. Updated whenever we allocate
+    // a new backing store. Any messages received that correspond to an earlier state are ignored,
+    // as they don't apply to our current backing store.
+    uint64_t m_currentBackingStoreStateID { 0 };
+
+    // The next backing store state ID we will request the web process update to. Incremented
+    // whenever our state changes in a way that will require a new backing store to be allocated.
+    uint64_t m_nextBackingStoreStateID { 0 };
+
+    // The current layer tree context.
+    LayerTreeContext m_layerTreeContext;
+
+    // Whether we've sent a UpdateBackingStoreState message and are now waiting for a DidUpdateBackingStoreState message.
+    // Used to throttle UpdateBackingStoreState messages so we don't send them faster than the Web process can handle.
+    bool m_isWaitingForDidUpdateBackingStoreState { false };
+
+    // For a new Drawing Area don't draw anything until the WebProcess has sent over the first content.
+    bool m_hasReceivedFirstUpdate { false };
+
+#if USE(TEXTURE_MAPPER_GL) && PLATFORM(GTK) && PLATFORM(X11) && !USE(REDIRECTED_XCOMPOSITE_WINDOW)
+    uint64_t m_pendingNativeSurfaceHandleForCompositing { 0 };
+#endif
+};
+
+} // namespace WebKit
+