am 6ecaff15: add a optional String to the key of notifications to allow users to scope them

Merge commit '6ecaff15836581336b1e8fad6ac42f3ff4a13544' into eclair-plus-aosp

* commit '6ecaff15836581336b1e8fad6ac42f3ff4a13544':
  add a optional String to the key of notifications to allow users