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|now_| and |now_ticks_| in TestMockTimeTaskRunner were read or written
without a lock. So, when PostDelayedTask() and NowTicks() are called
on different threads, it hits TSan failure.

This CL adds lock for all access to them to avoid the data race.

Change-Id: I562e2bfbd46b481b41faa05906b19c8664654812
Reviewed-on: https://chromium-review.googlesource.com/798819Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520779}