Add extension system and PDF viewer to Qt WebEngine

Adds the Chromium extensiuon system to Qt WebEngine.
Currently, it only exposes internal APIs to the internal
PDF viewer extension.

To load a PDF, simply navigate to it.

This feature can be configured via the webengine-extensions flag
and is turned on by default.

Needs patch in Chromium 71-based to build.

Adaptations to 71-based from 69-based include:
  * Flag out update installation, add crx file dependency
  * Move PostTask over to 71-based implementation
  * Move extensions API providers to 71-based implementaion
  * Don't use custom guest view and mime handler view delegates
  * Adapt the URLRequestResourceBundleJob to match new interface
  * Move extension system initialization to end of profile constructor

Change-Id: I4fa5149057291bb5847f048534c11820cd7ff58c
Fixes: QTBUG-50556
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

1 files changed, 158 insertions, 0 deletions

diff --git a/src/core/extensions/extension_system_qt.h b/src/core/extensions/extension_system_qt.h
new file mode 100644
index 000000000..0ebe1d044
--- /dev/null
+++ b/src/core/extensions/extension_system_qt.h
@@ -0,0 +1,158 @@
+/****************************************************************************
+**
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Large parts of this file are based on the source code from the file
+// chrome/browser/extensions/extension_system_impl.h from the Chromium sources.
+
+#ifndef EXTENSION_SYSTEM_QT_H
+#define EXTENSION_SYSTEM_QT_H
+
+#include <string>
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "build/build_config.h"
+#include "extensions/browser/extension_system.h"
+#include "extensions/common/extension_set.h"
+#include "extensions/common/one_shot_event.h"
+
+namespace extensions {
+
+class ExtensionRegistry;
+class InfoMap;
+class RendererStartupHelper;
+class ServiceWorkerManager;
+class StateStoreNotificationObserver;
+class ValueStoreFactory;
+class ValueStoreFactoryImpl;
+
+// The ExtensionSystem for ProfileImpl and OffTheRecordProfileImpl.
+// Implementation details: non-shared services are owned by
+// ExtensionSystemImpl, a KeyedService with separate incognito
+// instances. A private Shared class (also a KeyedService,
+// but with a shared instance for incognito) keeps the common services.
+class ExtensionSystemQt : public ExtensionSystem
+{
+public:
+    explicit ExtensionSystemQt(content::BrowserContext *browserContext);
+    ~ExtensionSystemQt() override;
+
+    // Initializes the extension system.
+    void Initialize();
+
+    // KeyedService implementation:
+    void Shutdown() override;
+
+    // ExtensionSystem implementation:
+    void InitForRegularProfile(bool extensions_enabled) override;
+    void InitForIncognitoProfile() override;
+    ExtensionService *extension_service() override;
+    RuntimeData *runtime_data() override;
+    ManagementPolicy *management_policy() override;
+    ServiceWorkerManager *service_worker_manager() override;
+    SharedUserScriptMaster *shared_user_script_master() override;
+    StateStore* state_store() override;
+    StateStore* rules_store() override;
+    scoped_refptr<ValueStoreFactory> store_factory() override;
+    InfoMap *info_map() override;
+    QuotaService *quota_service() override;
+    AppSorting *app_sorting() override;
+
+    void RegisterExtensionWithRequestContexts(const Extension *extension,
+                                              const base::Closure &callback) override;
+
+    void UnregisterExtensionWithRequestContexts(const std::string &extension_id,
+                                                const UnloadedExtensionReason reason) override;
+
+    ContentVerifier *content_verifier() override;
+    std::unique_ptr<ExtensionSet> GetDependentExtensions(const Extension *extension) override;
+
+#if !defined(TOOLKIT_QT)
+    void InstallUpdate(const std::string &extension_id,
+                       const std::string &public_key,
+                       const base::FilePath &unpacked_dir,
+                       bool install_immediately,
+                       InstallUpdateCallback install_update_callback) override;
+#endif // TOOLKIT_QT
+    //friend class ExtensionSystemSharedFactory;
+
+    bool FinishDelayedInstallationIfReady(const std::string &extension_id, bool install_immediately) override;
+
+    void Init(bool extensions_enabled);
+
+    const OneShotEvent &ready() const override { return ready_; }
+
+private:
+    void OnExtensionRegisteredWithRequestContexts(scoped_refptr<const extensions::Extension> extension);
+
+    void NotifyExtensionLoaded(const Extension *extension);
+    void LoadExtension(std::string extension_id, std::unique_ptr<base::DictionaryValue> manifest, const base::FilePath &directory);
+    // The services that are shared between normal and incognito profiles.
+
+    // Data to be accessed on the IO thread. Must outlive process_manager_.
+    scoped_refptr<InfoMap> info_map_;
+
+    std::unique_ptr<ServiceWorkerManager> service_worker_manager_;
+    std::unique_ptr<RuntimeData> runtime_data_;
+    std::unique_ptr<QuotaService> quota_service_;
+    std::unique_ptr<AppSorting> app_sorting_;
+    std::unique_ptr<SharedUserScriptMaster> shared_user_script_master_;
+
+
+    // For verifying the contents of extensions read from disk.
+    scoped_refptr<ContentVerifier> content_verifier_;
+    OneShotEvent ready_;
+
+    content::BrowserContext *browser_context_;
+    scoped_refptr<ValueStoreFactory> store_factory_;
+    ExtensionRegistry *extension_registry_;
+    extensions::RendererStartupHelper *renderer_helper_;
+    bool initialized_;
+
+    base::WeakPtrFactory<ExtensionSystemQt> weak_ptr_factory_;
+    DISALLOW_COPY_AND_ASSIGN(ExtensionSystemQt);
+};
+
+} // namespace extensions
+
+#endif // EXTENSION_SYSTEM_QT_H