[automerger skipped] Merge "Implement protobuf crossover function." am: 19b14ab2c3 am: 497126ee21 am: d69a747b4d  -s ours am: ef6d8f9c6a  -s ours
am: 7134567962  -s ours

Change-Id: Id6e9d959cf3bba8e988667a259770b725d771cf6