Get desktop application:
View/edit binary Protocol Buffers messages
A common interface implemented by the process manager and all background services in the SDK; see go/stadia-process-manager#heading=h.8da0zckti0ek.
Exit is used to ask the service to exit. In the case of the process manager, this cascades to all background processes.
GetPid is used to get the PID of the service process.
HealthCheck is used to verify that the service is running. It returns an empty protobuf if the service is ready to serve requests.