am 5dbd05ed: Intruder alert! (First try at the immersive-mode alert bar.)

Merge commit '5dbd05ed18906be3499978303f2fca4f86211567' into gingerbread-plus-aosp

* commit '5dbd05ed18906be3499978303f2fca4f86211567':
  Intruder alert! (First try at the immersive-mode alert bar.)