Use fake timer in Echo unit tests

Authored by SBisson on Jan 4 2017, 8:09 PM.

Description

Use fake timer in Echo unit tests

Freeze time to avoid a race condition
where a second is ticking in the middle
of a unit test.

Bug: T154188
Change-Id: I6b0c8ae06360e6da016d97361cc2ccdeaf2e4343

Details