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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 DELEGATED_FRAME_HOST_CLIENT_QT_H
+#define DELEGATED_FRAME_HOST_CLIENT_QT_H
+
+#include "qtwebenginecoreglobal_p.h"
+
+#include "content/browser/renderer_host/delegated_frame_host.h"
+#include "content/browser/renderer_host/render_widget_host_impl.h"
+
+namespace QtWebEngineCore {
+
+class RenderWidgetHostViewQt;
+class DelegatedFrameHostClientQt : public content::DelegatedFrameHostClient
+{
+public:
+    explicit DelegatedFrameHostClientQt(RenderWidgetHostViewQt *p) : p(p) {}
+
+    // Overridden from content::DelegatedFrameHostClient
+    ui::Layer *DelegatedFrameHostGetLayer() const override;
+    bool DelegatedFrameHostIsVisible() const override;
+    SkColor DelegatedFrameHostGetGutterColor() const override;
+    void OnBeginFrame(base::TimeTicks frame_time) override;
+    void OnFrameTokenChanged(uint32_t frame_token) override;
+    float GetDeviceScaleFactor() const override;
+    void InvalidateLocalSurfaceIdOnEviction() override;
+    std::vector<viz::SurfaceId> CollectSurfaceIdsForEviction() override;
+    bool ShouldShowStaleContentOnEviction() override;
+
+private:
+    RenderWidgetHostViewQt *p;
+};
+
+} // namespace QtWebEngineCore
+
+#endif // !DELEGATED_FRAME_HOST_CLIENT_QT_H