Merge "Move chat database operations to background. am: 00a58f92 am: f8332898 am: f98c9b4f am: 7c41f88d am: 0f2a748e" into oc-dr1-dev-plus-aosp am: 242b1c14 Change-Id: Id9eed3327e5ac425310aae93a859ea0b933c1109