commit 4658e9872de6d0b8d0dbdead10edad639f0125f7
author Suprabh Shukla <suprabh@google.com> Wed Sep 28 14:29:46 2016 -0700
committer Suprabh Shukla <suprabh@google.com> Fri Sep 30 15:04:44 2016 -0700
tree 00043dde02eca4b545c40168cbf05feeb361cd5f
parent 3ef6a5aaa0e822a3862a252c4ee4b32153bd157b

Enabling WAL

Enabled write ahead logging and made transactions non-exclusive so they
do not block threads that are trying to read from the database

Test: We use in-memory databases for testing, which means we cannot use
WAL there. To verify that WAL is indeed enabled, manually check that
the following log appears in the logcat, when opening the database:
ContactsDatabaseHelper: WAL enabled for contacts2.db: true

Bug: 30830389
Bug: 31600627
Change-Id: I47f452b837c823fd33e85aa799d0ca60ed970d73