Handle DB schema migration to facilitate android contacts backup

Add backup_id column to raw_contacts table
and hash_id column to data table.
Add unique index on backup_id and account_id of raw_contacts table.
Add index on hash_id of data table.
Update the raw_contacts and data view to add the new columns.

Bug: 18930508
Change-Id: I571c1115e7fb21e23b1956aaca8a80cf9d026e59
1 file changed