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Implements reading config from Finch with unittest.

Bug: 1004498
Change-Id: Ib4326314d849cf66d8e702359a71fba74649471d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808098
Commit-Queue: Hesen Zhang <hesen@chromium.org>
Auto-Submit: Hesen Zhang <hesen@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697058}