smbprovider: Add ebuild, USE mask flag, and system_api change

Add smbprovider ebuild, USE flag for arm, and also dependency in the
Chrome ebuild. Also add system_api ebuild change

BUG=chromium:757625
TEST=emerges on eve
CQ-DEPEND=CL:625074

Change-Id: I3cd1f8cf15cecf9ed23dbffdfe396cb8cd452fbf
Reviewed-on: https://chromium-review.googlesource.com/745102
Commit-Ready: Zentaro Kavanagh <zentaro@google.com>
Tested-by: Zentaro Kavanagh <zentaro@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
5 files changed