GitLab

Add a minimally-privileged sandbox. This is used by the
VideoCaptureService under Fuchsia, but is equivalent to no sandbox on
other platforms.

Bug: 998310
Test: CQ
Change-Id: I418d05b96e7489ab2bb0db6f7c360db7390d7c72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2161618Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Sharon Yang <yangsharon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763530}