Merge "Add a lock for call read/write operations to avoid ConcurrentModificationException." into sc-qpr1-dev am: 6ba0239947 am: 91fc8566b6
Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15662454 Change-Id: Id68f4cf5f01f8537b396bd8ffcff2df5e587580f
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