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diff --git a/src/core/devtools_frontend_qt.h b/src/core/devtools_frontend_qt.h
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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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef DEVTOOLS_FRONTEND_QT_H
+#define DEVTOOLS_FRONTEND_QT_H
+
+#include <memory>
+
+#include "web_contents_delegate_qt.h"
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "base/values.h"
+#include "content/public/browser/devtools_agent_host.h"
+#include "content/public/browser/devtools_frontend_host.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "net/url_request/url_fetcher_delegate.h"
+
+namespace base {
+class Value;
+}
+
+namespace content {
+class NavigationHandle;
+class RenderViewHost;
+class WebContents;
+}  // namespace content
+
+class PersistentPrefStore;
+
+namespace QtWebEngineCore {
+
+class DevToolsFrontendQt : public content::WebContentsObserver
+                         , public content::DevToolsAgentHostClient
+                         , public net::URLFetcherDelegate {
+public:
+    static DevToolsFrontendQt *Show(QSharedPointer<WebContentsAdapter> frontendAdapter, content::WebContents *inspectedContents);
+
+    void Activate();
+    void Focus();
+    void InspectElementAt(int x, int y);
+    void Close();
+
+    void DisconnectFromTarget();
+
+    void CallClientFunction(const std::string& function_name,
+                            const base::Value* arg1,
+                            const base::Value* arg2,
+                            const base::Value* arg3);
+
+    WebContentsDelegateQt *frontendDelegate() const
+    {
+        return m_frontendDelegate;
+    }
+
+protected:
+    DevToolsFrontendQt(QSharedPointer<WebContentsAdapter> webContentsAdapter, content::WebContents *inspectedContents);
+    ~DevToolsFrontendQt() override;
+
+    // content::DevToolsAgentHostClient implementation.
+    void AgentHostClosed(content::DevToolsAgentHost* agent_host, bool replaced) override;
+    void DispatchProtocolMessage(content::DevToolsAgentHost* agent_host, const std::string& message) override;
+
+    void SetPreferences(const std::string& json);
+    virtual void HandleMessageFromDevToolsFrontend(const std::string& message);
+
+private:
+    // WebContentsObserver overrides
+    void ReadyToCommitNavigation(content::NavigationHandle* navigation_handle) override;
+    void DocumentAvailableInMainFrame() override;
+    void WebContentsDestroyed() override;
+
+    // net::URLFetcherDelegate overrides.
+    void OnURLFetchComplete(const net::URLFetcher* source) override;
+
+    void SendMessageAck(int request_id, const base::Value* arg1);
+    void SetPreference(const std::string &name, const std::string &value);
+    void RemovePreference(const std::string &name);
+    void ClearPreferences();
+    void CreateJsonPreferences(bool clear);
+
+    // We shouldn't be keeping it alive
+    QWeakPointer<WebContentsAdapter> m_webContentsAdapter;
+    WebContentsDelegateQt *m_frontendDelegate;
+    content::WebContents *m_inspectedContents;
+    scoped_refptr<content::DevToolsAgentHost> m_agentHost;
+    int m_inspect_element_at_x;
+    int m_inspect_element_at_y;
+    std::unique_ptr<content::DevToolsFrontendHost> m_frontendHost;
+    using PendingRequestsMap = std::map<const net::URLFetcher*, int>;
+    PendingRequestsMap m_pendingRequests;
+    base::DictionaryValue m_preferences;
+    scoped_refptr<PersistentPrefStore> m_prefStore;
+    base::WeakPtrFactory<DevToolsFrontendQt> m_weakFactory;
+
+    DISALLOW_COPY_AND_ASSIGN(DevToolsFrontendQt);
+};
+
+} // namespace QtWebEngineCore
+
+#endif  // DEVTOOLS_FRONTEND_QT_H