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There are multiple reasons for which we show same message in case of
sign-in and check-in failure so we're adding an error code on the UI
to help distinguish the underlying reasons.

BUG=b:166322619
TEST=deploy to DUT, force the sign-in failure, verify message is shown

Change-Id: If8e758d02777c3aaa5ced74ac44eaa54dee8a59e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2569988
Commit-Queue: Muhammad Hasan Khan <mhasank@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833795}