Add contact search display name experiment (1/2)

We make two queries which check if the display
name exactly matches the phonetic name in order
to prevent duplicates when the display name is
coming from the phonetic name.

Bug 26697731

Change-Id: Iab2e8b158bcc6f6df06c23da257d9d930363e60a
(cherry picked from commit 142ad048c17284aa14e9f88a31074fe2ee5a6f45)