Grace Jia c71732375d Add a lock for call read/write operations to avoid
ConcurrentModificationException.

Bug: 189816293
Test: InCallService cts tests
Change-Id: I123b2de55b856d12ee2a5e6d2fa49c15a74592fc
2021-08-23 22:31:53 +00:00
..
2020-09-03 23:29:16 +00:00