LibWeb: Abstract the LibProtocol WebSockets connection

Much like the ImageDecoder change, this moves the underlying connection
of the Web::WebSockets class from LibWeb to LibWebView, removing the
need for LibProtocol in LibWeb for this specific use-case.

Userland/Libraries/LibWebView/WebSocketClientAdapter.h

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2022, Dex♪ <dexes.ttp@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Error.h>
+#include <AK/NonnullRefPtr.h>
+#include <AK/Weakable.h>
+#include <LibWeb/WebSockets/WebSocket.h>
+
+namespace Protocol {
+class WebSocket;
+class WebSocketClient;
+};
+
+namespace WebView {
+
+class WebSocketClientSocketAdapter
+    : public Web::WebSockets::WebSocketClientSocket
+    , public Weakable<WebSocketClientSocketAdapter> {
+public:
+    static RefPtr<WebSocketClientSocketAdapter> create(NonnullRefPtr<Protocol::WebSocket>);
+    virtual ~WebSocketClientSocketAdapter() override;
+
+    virtual Web::WebSockets::WebSocket::ReadyState ready_state() override;
+
+    virtual void send(ByteBuffer binary_or_text_message, bool is_text) override;
+    virtual void send(StringView text_message) override;
+    virtual void close(u16 code = 1005, String reason = {}) override;
+
+private:
+    WebSocketClientSocketAdapter(NonnullRefPtr<Protocol::WebSocket>);
+
+    NonnullRefPtr<Protocol::WebSocket> m_websocket;
+};
+
+class WebSocketClientManagerAdapter : public Web::WebSockets::WebSocketClientManager {
+public:
+    static ErrorOr<NonnullRefPtr<WebSocketClientManagerAdapter>> try_create();
+
+    virtual ~WebSocketClientManagerAdapter() override;
+
+    virtual RefPtr<Web::WebSockets::WebSocketClientSocket> connect(const AK::URL&, String const& origin) override;
+
+private:
+    WebSocketClientManagerAdapter(NonnullRefPtr<Protocol::WebSocketClient>);
+
+    NonnullRefPtr<Protocol::WebSocketClient> m_websocket_client;
+};
+
+}