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diff --git a/src/core/delegated_frame_node.h b/src/core/delegated_frame_node.h
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--- a/src/core/delegated_frame_node.h
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-/****************************************************************************
-**
-** Copyright (C) 2016 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_NODE_H
-#define DELEGATED_FRAME_NODE_H
-
-#include "base/containers/circular_deque.h"
-#include "components/viz/common/quads/compositor_frame.h"
-#include "components/viz/common/quads/render_pass.h"
-#include "components/viz/common/resources/transferable_resource.h"
-#include "gpu/command_buffer/service/sync_point_manager.h"
-#include "ui/gl/gl_fence.h"
-#include <QMutex>
-#include <QSGNode>
-#include <QSharedData>
-#include <QSharedPointer>
-#include <QWaitCondition>
-#include <QtGui/QOffscreenSurface>
-
-#include "chromium_gpu_helper.h"
-#include "render_widget_host_view_qt_delegate.h"
-
-QT_BEGIN_NAMESPACE
-class QSGLayer;
-QT_END_NAMESPACE
-
-namespace gfx {
-class QuadF;
-}
-
-namespace viz {
-class DelegatedFrameData;
-class DrawQuad;
-class DrawPolygon;
-}
-
-namespace QtWebEngineCore {
-
-class DelegatedNodeTreeHandler;
-class MailboxTexture;
-class ResourceHolder;
-
-// Separating this data allows another DelegatedFrameNode to reconstruct the QSGNode tree from the mailbox textures
-// and render pass information.
-class ChromiumCompositorData : public QSharedData {
-public:
-    ChromiumCompositorData() : frameDevicePixelRatio(1) { }
-    QHash<unsigned, QSharedPointer<ResourceHolder> > resourceHolders;
-    viz::CompositorFrame frameData;
-    viz::CompositorFrame previousFrameData;
-    qreal frameDevicePixelRatio;
-};
-
-class DelegatedFrameNode : public QSGTransformNode {
-public:
-    DelegatedFrameNode();
-    ~DelegatedFrameNode();
-    void preprocess();
-    void commit(ChromiumCompositorData *chromiumCompositorData, std::vector<viz::ReturnedResource> *resourcesToRelease, RenderWidgetHostViewQtDelegate *apiDelegate);
-
-private:
-    void flushPolygons(base::circular_deque<std::unique_ptr<viz::DrawPolygon> > *polygonQueue,
-        QSGNode *renderPassChain,
-        DelegatedNodeTreeHandler *nodeHandler,
-        QHash<unsigned, QSharedPointer<ResourceHolder> > &resourceCandidates,
-        RenderWidgetHostViewQtDelegate *apiDelegate);
-    void handlePolygon(
-        const viz::DrawPolygon *polygon,
-        QSGNode *currentLayerChain,
-        DelegatedNodeTreeHandler *nodeHandler,
-        QHash<unsigned, QSharedPointer<ResourceHolder> > &resourceCandidates,
-        RenderWidgetHostViewQtDelegate *apiDelegate);
-    void handleClippedQuad(
-        const viz::DrawQuad *quad,
-        const gfx::QuadF &clipRegion,
-        QSGNode *currentLayerChain,
-        DelegatedNodeTreeHandler *nodeHandler,
-        QHash<unsigned, QSharedPointer<ResourceHolder> > &resourceCandidates,
-        RenderWidgetHostViewQtDelegate *apiDelegate);
-    void handleQuad(
-        const viz::DrawQuad *quad,
-        QSGNode *currentLayerChain,
-        DelegatedNodeTreeHandler *nodeHandler,
-        QHash<unsigned, QSharedPointer<ResourceHolder> > &resourceCandidates,
-        RenderWidgetHostViewQtDelegate *apiDelegate);
-    void fetchAndSyncMailboxes(QList<MailboxTexture *> &mailboxesToFetch);
-    // Making those callbacks static bypasses base::Bind's ref-counting requirement
-    // of the this pointer when the callback is a method.
-    static void pullTexture(DelegatedFrameNode *frameNode, MailboxTexture *mailbox);
-    static void pullTextures(DelegatedFrameNode *frameNode, const QVector<MailboxTexture *> mailboxes);
-    static void fenceAndUnlockQt(DelegatedFrameNode *frameNode);
-    static void unlockQt(DelegatedFrameNode *frameNode);
-
-    ResourceHolder *findAndHoldResource(unsigned resourceId, QHash<unsigned, QSharedPointer<ResourceHolder> > &candidates);
-    void holdResources(const viz::DrawQuad *quad, QHash<unsigned, QSharedPointer<ResourceHolder> > &candidates);
-    void holdResources(const viz::RenderPass *pass, QHash<unsigned, QSharedPointer<ResourceHolder> > &candidates);
-    QSGTexture *initAndHoldTexture(ResourceHolder *resource, bool quadIsAllOpaque, RenderWidgetHostViewQtDelegate *apiDelegate = 0);
-
-    QExplicitlySharedDataPointer<ChromiumCompositorData> m_chromiumCompositorData;
-    struct SGObjects {
-        QVector<QPair<int, QSharedPointer<QSGLayer> > > renderPassLayers;
-        QVector<QSharedPointer<QSGRootNode> > renderPassRootNodes;
-        QVector<QSharedPointer<QSGTexture> > textureStrongRefs;
-    } m_sgObjects;
-    QVector<QSGNode*> m_sceneGraphNodes;
-    int m_numPendingSyncPoints;
-    QWaitCondition m_mailboxesFetchedWaitCond;
-    QMutex m_mutex;
-    QList<gl::TransferableFence> m_textureFences;
-#if defined(USE_OZONE)
-    bool m_contextShared;
-    QScopedPointer<QOffscreenSurface> m_offsurface;
-#endif
-    QSize m_previousViewportSize;
-};
-
-} // namespace QtWebEngineCore
-
-#endif // DELEGATED_FRAME_NODE_H