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In order to better understand the feedback reports, adding logging in key events of arc provisioning process.

BUG=b:162221783
TEST=deploy to dut, disable playstore, re-enable playstore, successfully
finish the authorization flow

Change-Id: I3f5cbfd0cb023c43982e15a5aba724901a4fe3e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2377229
Commit-Queue: Muhammad Hasan Khan <mhasank@chromium.org>
Commit-Queue: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Auto-Submit: Muhammad Hasan Khan <mhasank@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804051}