am a8d8b1cb: ContactsProvider2 optimization: accumulating setDirty(true) per transaction

Merge commit 'a8d8b1cb48a6e94645dbce836193b40c7481356c' into eclair-mr2-plus-aosp

* commit 'a8d8b1cb48a6e94645dbce836193b40c7481356c':
  ContactsProvider2 optimization: accumulating setDirty(true) per transaction