system_api: Add Smbprovider Mount and Unmount protobuf

Add MountOptions and UnmountOptions protobuf.

BUG=chromium:757625
TEST=runs locally

Change-Id: I56b2f8f9e752883d42fc73ada52f1204ba31c872
Reviewed-on: https://chromium-review.googlesource.com/757869
Commit-Ready: Allen Vicencio <allenvic@chromium.org>
Tested-by: Allen Vicencio <allenvic@chromium.org>
Reviewed-by: Lutz Justen <ljusten@chromium.org>
Reviewed-by: Roman Sorokin <rsorokin@chromium.org>
1 file changed