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diff --git a/src/core/compositor/display_producer.h b/src/core/compositor/display_producer.h
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+/****************************************************************************
+**
+** Copyright (C) 2019 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_PRODUCER_H
+#define DISPLAY_PRODUCER_H
+
+#include "qtwebenginecoreglobal_p.h"
+
+QT_BEGIN_NAMESPACE
+class QSGNode;
+QT_END_NAMESPACE
+
+namespace QtWebEngineCore {
+class RenderWidgetHostViewQtDelegate;
+
+// Produces composited frames for display.
+class DisplayProducer
+{
+public:
+    // Generate scene graph nodes for the current frame.
+    //
+    // If this is a scheduled update (that is, scheduleUpdate was called
+    // earlier), then updatePaintNode will generate nodes for a new frame.
+    // Otherwise, it will just regenerate nodes for the old frame.
+    virtual QSGNode *updatePaintNode(QSGNode *oldNode, RenderWidgetHostViewQtDelegate *delegate) = 0;
+
+protected:
+    ~DisplayProducer() {}
+};
+
+} // namespace QtWebEngineCore
+
+#endif // !DISPLAY_PRODUCER_H