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This change makes FakePowerManagerClient now use mock ticks for timers.
This means that timer expiration can be tested more strigently in tests
instead of earlier tests where only timer expiration was checked and not
the time when they expired.

BUG=962638
TEST=Unit tests.

Change-Id: Ic6b94e927dff2b55d9b622d77f663e377be7a4f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610224
Commit-Queue: Abhishek Bhardwaj <abhishekbh@chromium.org>
Auto-Submit: Abhishek Bhardwaj <abhishekbh@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659425}