Google created seccomp-bpf which is crucial to a meaningful sandbox and has no equivalent on other platforms. It was not an obvious innovation or it would have been done years earlier. It exists because someone paid by Google to improve Chromium security had the epiphany that BPF would be a good way to filter system calls.
Claiming that Chrome pioneered sandboxing doesn't pass the smell test, irrespective of how many Google employees (according to your profile) are backing you up.
