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This CL is based on the review comments from crrev.com/c/1816495. To
unify the enum on AppService, we prefer update the enum start from 0 to
10.

BUG=1005640

Change-Id: Ifb70a24b1a3c1c4ac0693206c6df23cb190d067d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1837551Reviewed-by: Nigel Tao <nigeltao@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704001}