CountDownTimer: not skip onTick()

CoundDownTimer internally performs counting down with a handler and
fires onTick() callback at countdown intervals. At this internal
counting down, firing onTick() is skipped if the account of time until
finished is less than countdown interval. Due to this skip of onTick(),
user will miss last onTick() callback.

This change ensures CountDownTimer to fires every onTick() callback
until the time is up.

Bug: 32392931
Change-Id: I951f5cd46743873d7f8c353f8cf8c700999d8ae0