Stop animation when screen times out and the user turns on the phone.

Test: manual.
  1. set lock mode to none (keep showing Settings activity)
  2. wait until the screen times out
  3. tap screen to turn on the screen
  4. verity no animation is applied on the Settings activity
Bug: 189438446
Change-Id: I5d7d0983e1d3f1dc5731eac1606417863a890e65