Add GetShares to SmbProviderClient

Bug: chromium:757625
Change-Id: I519a7baf67bc30084bab6af1dd7c9e2404d45317
Reviewed-on: https://chromium-review.googlesource.com/959526
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Allen Vicencio <allenvic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544934}
4 files changed