am 315dd702: ContactsProvider2 optimization: using a Bloom filter for lookup of known nicknames

Merge commit '315dd702d006aedf2f867d3fe49e31e05e4f9a16' into eclair-mr2-plus-aosp

* commit '315dd702d006aedf2f867d3fe49e31e05e4f9a16':
  ContactsProvider2 optimization: using a Bloom filter for lookup of known nicknames