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diff --git a/src/core/platform_notification_service_qt.cpp b/src/core/platform_notification_service_qt.cpp
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+++ b/src/core/platform_notification_service_qt.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2017 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "platform_notification_service_qt.h"
+
+#include "chrome/common/pref_names.h"
+#include "components/prefs/pref_service.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/permission_type.h"
+#include "content/public/browser/notification_event_dispatcher.h"
+#include "ui/message_center/public/cpp/notification_delegate.h"
+
+#include "profile_adapter.h"
+#include "profile_adapter_client.h"
+#include "profile_qt.h"
+#include "user_notification_controller.h"
+#include "resource_context_qt.h"
+#include "type_conversion.h"
+
+#include <QSharedPointer>
+
+namespace QtWebEngineCore {
+
+struct NonPersistentNotificationDelegate : UserNotificationController::Delegate {
+    NonPersistentNotificationDelegate(const std::string &id) : notification_id(id) { }
+
+    virtual void shown() override {
+        Q_ASSERT(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+        if (auto inst = content::NotificationEventDispatcher::GetInstance())
+            inst->DispatchNonPersistentShowEvent(notification_id);
+    }
+
+    virtual void clicked() override {
+        Q_ASSERT(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+        if (auto inst = content::NotificationEventDispatcher::GetInstance())
+            inst->DispatchNonPersistentClickEvent(notification_id, base::DoNothing());
+    }
+
+    virtual void closed(bool /*by_user*/) override {
+        Q_ASSERT(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+        if (auto inst = content::NotificationEventDispatcher::GetInstance())
+            inst->DispatchNonPersistentCloseEvent(notification_id, base::DoNothing());
+    }
+
+    const std::string notification_id;
+};
+
+struct PersistentNotificationDelegate : UserNotificationController::Delegate {
+    PersistentNotificationDelegate(content::BrowserContext *context, const std::string &id, const GURL &origin)
+        : browser_context(context), notification_id(id), origin(origin) { }
+
+    virtual void shown() override { }
+
+    virtual void clicked() override {
+        Q_ASSERT(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+        if (auto inst = content::NotificationEventDispatcher::GetInstance())
+            inst->DispatchNotificationClickEvent(browser_context, notification_id, origin, base::nullopt, base::nullopt, base::DoNothing());
+    }
+
+    virtual void closed(bool by_user) override {
+        Q_ASSERT(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+        if (auto inst = content::NotificationEventDispatcher::GetInstance())
+            inst->DispatchNotificationCloseEvent(browser_context, notification_id, origin, by_user, base::DoNothing());
+    }
+
+    content::BrowserContext *browser_context;
+    const std::string notification_id;
+    const GURL origin;
+};
+
+
+PlatformNotificationServiceQt::PlatformNotificationServiceQt() {}
+
+PlatformNotificationServiceQt::~PlatformNotificationServiceQt() {}
+
+void PlatformNotificationServiceQt::DisplayNotification(
+        content::BrowserContext *browser_context,
+        const std::string &notification_id,
+        const GURL &origin,
+        const blink::PlatformNotificationData &notificationData,
+        const blink::NotificationResources &notificationResources)
+{
+    Q_ASSERT(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+    ProfileQt *profile = static_cast<ProfileQt*>(browser_context);
+
+    auto delegate = new NonPersistentNotificationDelegate(notification_id);
+    QSharedPointer<UserNotificationController> controller(
+                new UserNotificationController(notificationData, notificationResources, origin, delegate));
+
+    profile->profileAdapter()->ephemeralNotifications().insert(QByteArray::fromStdString(notification_id), controller);
+
+    const QList<ProfileAdapterClient *> clients = profile->profileAdapter()->clients();
+    for (ProfileAdapterClient *client : clients)
+        client->showNotification(controller);
+}
+
+void PlatformNotificationServiceQt::DisplayPersistentNotification(
+        content::BrowserContext *browser_context,
+        const std::string &notification_id,
+        const GURL &service_worker_origin,
+        const GURL &origin,
+        const blink::PlatformNotificationData &notificationData,
+        const blink::NotificationResources &notificationResources)
+{
+    Q_ASSERT(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+    ProfileQt * profile = static_cast<ProfileQt*>(browser_context);
+
+    auto delegate = new PersistentNotificationDelegate(profile, notification_id, service_worker_origin);
+    QSharedPointer<UserNotificationController> controller(
+                new UserNotificationController(notificationData, notificationResources, service_worker_origin, delegate));
+
+    profile->profileAdapter()->persistentNotifications().insert(QByteArray::fromStdString(notification_id), controller);
+    const QList<ProfileAdapterClient *> clients = profile->profileAdapter()->clients();
+    for (ProfileAdapterClient *client : clients)
+        client->showNotification(controller);
+}
+
+void PlatformNotificationServiceQt::CloseNotification(
+        content::BrowserContext *browser_context,
+        const std::string &notification_id)
+{
+    Q_ASSERT(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+    ProfileQt *profile = static_cast<ProfileQt*>(browser_context);
+
+    QSharedPointer<UserNotificationController> notificationController =
+            profile->profileAdapter()->ephemeralNotifications().take(QByteArray::fromStdString(notification_id)).lock();
+    if (notificationController)
+        notificationController->closeNotification();
+}
+
+void PlatformNotificationServiceQt::ClosePersistentNotification(
+        content::BrowserContext *browser_context,
+        const std::string &notification_id)
+{
+    Q_ASSERT(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+    ProfileQt *profile = static_cast<ProfileQt*>(browser_context);
+
+    QSharedPointer<UserNotificationController> notificationController =
+            profile->profileAdapter()->persistentNotifications().take(QByteArray::fromStdString(notification_id));
+    if (notificationController)
+        notificationController->closeNotification();
+}
+
+void PlatformNotificationServiceQt::GetDisplayedNotifications(
+        content::BrowserContext *browser_context,
+        const DisplayedNotificationsCallback &callback)
+{
+    Q_ASSERT(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+    ProfileQt *profile = static_cast<ProfileQt *>(browser_context);
+
+    std::unique_ptr<std::set<std::string>> movableStdStringSet = std::make_unique<std::set<std::string>>();
+    auto it = profile->profileAdapter()->persistentNotifications().constBegin();
+    const auto end = profile->profileAdapter()->persistentNotifications().constEnd();
+    while (it != end) {
+        if (it.value()->isShown())
+            movableStdStringSet->insert(it.key().toStdString());
+        ++it;
+    }
+
+    callback.Run(std::move(movableStdStringSet), true /* supports_synchronization */);
+}
+
+int64_t PlatformNotificationServiceQt::ReadNextPersistentNotificationId(content::BrowserContext *browser_context)
+{
+    Q_ASSERT(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+    auto prefs = static_cast<ProfileQt *>(browser_context)->GetPrefs();
+    int64_t nextId = prefs->GetInteger(prefs::kNotificationNextPersistentId) + 1;
+    prefs->SetInt64(prefs::kNotificationNextPersistentId, nextId);
+    return nextId;
+}
+
+} // namespace QtWebEngineCore