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A future CL will rename this to FakeClock.

Change-Id: I105d1d0278eb15eb0601fd40b45f738cd9cad7ff
Reviewed-on: https://chromium-review.googlesource.com/1163832
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Zhongyi Shi <zhongyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580936}