A proxy context is a virgl_context that forwards context method calls to
a remote process.
On virgl_renderer_init, it starts the render server and connects to it.
On each virgl_renderer_context_create, it requests the render server to
fork a context process such that it can forward context method calls to
the context process.
Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
Reviewed-by: Ryan Neph <ryanneph@google.com>