@gen.coroutine
  def MergeAccounts(self, client, viewpoint_id, target_user_id):
    # Query the viewpoint visible_to accounting.  The target user's visible_to will be adjusted by this much.
    vp_vt_acc = yield gen.Task(Accounting.QueryViewpointVisibleTo, client, viewpoint_id, must_exist=False)
    if vp_vt_acc is not None:
      self.GetUserVisibleTo(target_user_id).IncrementStatsFrom(vp_vt_acc)
Validate the contents of an AEAD using the YubiHSM. The matching is done
dataset/ETHPy150Open viewfinderco/viewfinder/backend/db/accounting.py/AccountingAccumulator.MergeAccounts--crossover with--dataset/ETHPy150Open Yubico/python-pyhsm/pyhsm/base.py/YHSM.validate_aead