LibWebView+ImageDecoder+RequestServer+WebContent: Add init_transport

Author: https://github.com/stasoid
Commit: 3e46cb9067
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3179
Reviewed-by: https://github.com/ADKaster ✅

Libraries/LibImageDecoderClient/Client.h

@@ -34,6 +34,8 @@ class Client final
     C_OBJECT_ABSTRACT(Client);
 
 public:
+    using InitTransport = Messages::ImageDecoderServer::InitTransport;
+
     Client(IPC::Transport);
 
     NonnullRefPtr<Core::Promise<DecodedImage>> decode_image(ReadonlyBytes, Function<ErrorOr<void>(DecodedImage&)> on_resolved, Function<void(Error&)> on_rejected, Optional<Gfx::IntSize> ideal_size = {}, Optional<ByteString> mime_type = {});