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diff --git a/src/core/compositor/display_skia_output_device.h b/src/core/compositor/display_skia_output_device.h
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+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef DISPLAY_SKIA_OUTPUT_DEVICE_H
+#define DISPLAY_SKIA_OUTPUT_DEVICE_H
+
+#include "compositor_resource_fence.h"
+#include "compositor.h"
+
+#include "base/threading/thread_task_runner_handle.h"
+#include "components/viz/service/display_embedder/skia_output_device.h"
+#include "gpu/command_buffer/service/shared_context_state.h"
+
+#include <QMutex>
+
+namespace QtWebEngineCore {
+
+class DisplaySkiaOutputDevice final : public viz::SkiaOutputDevice, public Compositor
+{
+public:
+    DisplaySkiaOutputDevice(scoped_refptr<gpu::SharedContextState> contextState,
+                            gpu::MemoryTracker *memoryTracker,
+                            DidSwapBufferCompleteCallback didSwapBufferCompleteCallback);
+    ~DisplaySkiaOutputDevice() override;
+
+    // Overridden from SkiaOutputDevice.
+    void SetFrameSinkId(const viz::FrameSinkId &frame_sink_id) override;
+    bool Reshape(const gfx::Size& size,
+                 float devicePixelRatio,
+                 const gfx::ColorSpace& colorSpace,
+                 gfx::BufferFormat format,
+                 gfx::OverlayTransform transform) override;
+    void SwapBuffers(BufferPresentedCallback feedback,
+                     std::vector<ui::LatencyInfo> latencyInfo) override;
+    void EnsureBackbuffer() override;
+    void DiscardBackbuffer() override;
+    SkSurface *BeginPaint(std::vector<GrBackendSemaphore> *semaphores) override;
+    void EndPaint() override;
+
+    // Overridden from Compositor.
+    void swapFrame() override;
+    void waitForTexture() override;
+    int textureId() override;
+    QSize size() override;
+    bool hasAlphaChannel() override;
+    float devicePixelRatio() override;
+
+private:
+    struct Shape
+    {
+        gfx::Size sizeInPixels;
+        float devicePixelRatio;
+        gfx::ColorSpace colorSpace;
+        gfx::BufferFormat format;
+
+        bool operator==(const Shape &that) const
+        {
+            return (sizeInPixels == that.sizeInPixels &&
+                    devicePixelRatio == that.devicePixelRatio &&
+                    colorSpace == that.colorSpace &&
+                    format == that.format);
+        }
+        bool operator!=(const Shape &that) const { return !(*this == that); }
+    };
+
+    class Buffer;
+
+    void SwapBuffersFinished();
+
+    mutable QMutex m_mutex;
+    scoped_refptr<gpu::SharedContextState> m_contextState;
+    Shape m_shape;
+    std::unique_ptr<Buffer> m_frontBuffer;
+    std::unique_ptr<Buffer> m_middleBuffer;
+    std::unique_ptr<Buffer> m_backBuffer;
+    std::vector<ui::LatencyInfo> m_latencyInfo;
+    bool m_readyToUpdate = false;
+    scoped_refptr<base::SingleThreadTaskRunner> m_taskRunner;
+};
+
+} // namespace QtWebEngineCore
+
+#endif // !DISPLAY_SKIA_OUTPUT_DEVICE_H