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diff --git a/src/core/compositor_resource.h b/src/core/compositor_resource.h
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+/****************************************************************************
+**
+** Copyright (C) 2018 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 COMPOSITOR_RESOURCE_H
+#define COMPOSITOR_RESOURCE_H
+
+#include <base/memory/ref_counted.h>
+#include <components/viz/common/resources/transferable_resource.h>
+
+#include <QtCore/qglobal.h>
+#include <QtGui/qtgui-config.h>
+
+#if QT_CONFIG(opengl)
+# include "compositor_resource_fence.h"
+#endif
+
+namespace viz {
+class SharedBitmap;
+} // namespace viz
+
+namespace QtWebEngineCore {
+
+using CompositorResourceId = quint32;
+
+// A resource (OpenGL texture or software shared bitmap).
+//
+// - Created by the CompositorResourceTracker from a newly submitted
+//   CompositorFrame's resource_list.
+//
+// - Until the frame is committed, its resources are in a 'pending' state and
+//   are inaccessible from outside the CompositorResourceTracker.
+//
+// - Once the frame is committed, its resources can be found via
+//   CompositorResourceTracker::findResource.
+//
+// - A committed resource's fields may not be updated and are safe to use from
+//   other threads without synchronization (unless noted otherwise).
+struct CompositorResource : viz::TransferableResource
+{
+    CompositorResource(const viz::TransferableResource &tr) : viz::TransferableResource(tr) {}
+
+    // Counts the number of times this resource has been encountered in
+    // CompositorFrames' resource lists.
+    //
+    // Corresponds to viz::ReturnedResource::count.
+    //
+    // Updated by CompositorResourceTracker on UI thread.
+    int import_count = 1;
+
+    // Identifies the last frame that needed this resource. Used by
+    // CompositorResourceTracker to return unused resources back to child
+    // compositors.
+    //
+    // Updated by CompositorResourceTracker on UI thread.
+    quint32 last_used_for_frame = 0;
+
+    // Bitmap (if is_software).
+    std::unique_ptr<viz::SharedBitmap> bitmap;
+
+#if QT_CONFIG(opengl)
+    // OpenGL texture id (if !is_software).
+    quint32 texture_id = 0;
+
+    // Should be waited on before using the texture (non-null if !is_software).
+    scoped_refptr<CompositorResourceFence> texture_fence;
+#endif // QT_CONFIG(opengl)
+};
+
+inline bool operator<(const CompositorResource &r1, const CompositorResource &r2)
+{
+    return r1.id < r2.id;
+}
+
+inline bool operator<(const CompositorResource &r, CompositorResourceId id)
+{
+    return r.id < id;
+}
+
+inline bool operator<(CompositorResourceId id, const CompositorResource &r)
+{
+    return id < r.id;
+}
+
+} // namespace QtWebEngineCore
+
+#endif // !COMPOSITOR_RESOURCE_H