am 51900639: Merge "Synchronize on all sendProxyBroadcast calls" into lmp-dev

* commit '519006395204ba3eab77ae420d20eb70ebb78af5':
  Synchronize on all sendProxyBroadcast calls
tree: f462b17dd54f15544f27d426f03d81b2acc61a57
  1. core/
  2. services/
  3. tests/