Ladybird: Move Qt-specific classes and functions to a Qt subdirectory

This will help a lot with developing chromes for different UI frameworks
where we can see which helper classes and processes are really using Qt
vs just using it to get at helper data.

As a bonus, remove Qt dependency from WebDriver.

Ladybird/Qt/ConsoleWidget.h

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2020, Hunter Salyer <thefalsehonesty@gmail.com>
+ * Copyright (c) 2021-2022, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
+ * Copyright (c) 2022, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/DeprecatedString.h>
+#include <AK/Function.h>
+#include <AK/Vector.h>
+#include <QLineEdit>
+#include <QWidget>
+
+class QLineEdit;
+namespace Ladybird {
+
+class WebContentView;
+
+class ConsoleWidget final : public QWidget {
+    Q_OBJECT
+public:
+    ConsoleWidget();
+    virtual ~ConsoleWidget() = default;
+
+    void notify_about_new_console_message(i32 message_index);
+    void handle_console_messages(i32 start_index, Vector<DeprecatedString> const& message_types, Vector<DeprecatedString> const& messages);
+    void print_source_line(StringView);
+    void print_html(StringView);
+    void reset();
+
+    WebContentView& view() { return *m_output_view; }
+
+    Function<void(DeprecatedString const&)> on_js_input;
+    Function<void(i32)> on_request_messages;
+
+private:
+    void request_console_messages();
+    void clear_output();
+
+    WebContentView* m_output_view { nullptr };
+    QLineEdit* m_input { nullptr };
+
+    i32 m_highest_notified_message_index { -1 };
+    i32 m_highest_received_message_index { -1 };
+    bool m_waiting_for_messages { false };
+};
+
+class ConsoleInputEdit final : public QLineEdit {
+    Q_OBJECT
+public:
+    ConsoleInputEdit(QWidget* q_widget, ConsoleWidget& console_widget)
+        : QLineEdit(q_widget)
+        , m_console_widget(console_widget)
+    {
+    }
+
+private:
+    virtual void keyPressEvent(QKeyEvent* event) override;
+
+    ConsoleWidget& m_console_widget;
+    Vector<DeprecatedString> m_history;
+    size_t m_history_index { 0 };
+};
+
+}