am 866362fc: Merge "Usage Stats: don\'t block writing stats to disk." into gingerbread

Merge commit '866362fcb4db93584143c21934ea355cbf9e0757' into gingerbread-plus-aosp

* commit '866362fcb4db93584143c21934ea355cbf9e0757':
  Usage Stats: don't block writing stats to disk.