Implement CreateDirectory in SmbFileSystem

Bug: chromium:757625
Change-Id: I781ee0ab1cfff9669797dbe796a2b3a84856560a
Reviewed-on: https://chromium-review.googlesource.com/915241
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Allen Vicencio <allenvic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536485}
2 files changed