am 753e5609: Merge "docs: update backup dev guide with Android Backup Service registration info" into froyo

Merge commit '753e56090ed5acc0d2173a8e9ab1a9b96528720b' into froyo-plus-aosp

* commit '753e56090ed5acc0d2173a8e9ab1a9b96528720b':
  docs: update backup dev guide with Android Backup Service registration info