When "--gpu-render-server path=<path>" is specified, start the render
server shipped with virglrenderer and initialize virglrenderer with
VIRGLRENDERER_MULTI_PROCESS flag.
The flag makes virgl_renderer_context_create_with_flags create proxy
contexts instead of venus contexts. Each proxy context requests the
render server to fork a subprocess and executes GPU commands in the
subprocess.
BUG=b:177267762
TEST=run vk and gl apps on volteer
Change-Id: If5e2dc3353572cadb60b0c25a3e0ad14f633db91
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3283508
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Chia-I Wu <olv@google.com>