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This allows not to use expensive and fragile set of adb commands and
returns ARC provisioning state as it appears in Chrome.

TEST=in context of crrev.com/i/717828
BUG=b:119349367

Change-Id: I3582fcca3e36a084dbe8e0ff3522930504ebeb85
Reviewed-on: https://chromium-review.googlesource.com/c/1340797Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608980}