Merge "Refactor how StatusBarPolicy knows if keyguard is visible." into nyc-dev am: bbd26bc023
am: d1d0c558b7

* commit 'd1d0c558b78f3504919c77140ee45b71cadfbe38':
  Refactor how StatusBarPolicy knows if keyguard is visible.

Change-Id: Icc3aeb92780317c8fa4259434e96d17bf16448f3