am 33462598: am bea98acf: reconcile open-source froyo into google variant

Merge commit '33462598d8c20001483f3f2e1bca155fa3a83cd5' into gingerbread-plus-aosp

* commit '33462598d8c20001483f3f2e1bca155fa3a83cd5':
  Explicitly enable backup by default in SDK builds