am 2e7fbd97: Merge "Preapre region tracking in layers" into honeycomb
* commit '2e7fbd97e6f3682b20631d4f5262321dba6e2c6f': Preapre region tracking in layers
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* commit '2e7fbd97e6f3682b20631d4f5262321dba6e2c6f': Preapre region tracking in layers