am f46a9cf3: API to combine LOOKUP_KEY and Contacts._ID together.

Merge commit 'f46a9cf38207d03730c04d02cf40aa3859cd9ad3' into eclair-plus-aosp

* commit 'f46a9cf38207d03730c04d02cf40aa3859cd9ad3':
  API to combine LOOKUP_KEY and Contacts._ID together.