It turned out that some web applications want to send fairly large
messages to WebWorker through IPC (for example, MapLibre GL sends
~1200KiB), which led to failures (at least on macOS) because buffer size
of TransportSocket is limited to 128KiB. This change solves the problem
by wrapping messages that exceed socket buffer size into another message
that holds wrapped message content in shared memory.
Co-Authored-By: Luke Wilde <luke@ladybird.org>
This has been a longstanding ergonomic issue with our IPC compiler. Non-
trivial types were previously passed by const&. So if we wanted to avoid
expensive copies, we would have to const_cast and move the data.
We now pass ownership of all transferred data to the client subclasses.
This allows us to remove const_cast from these methods, and allows us to
avoid some trivial expensive copies that we didn't bother to const_cast.
