am d8de2ba4: Merge change 5750 into donut

Merge commit 'd8de2ba42679a10db2adc11995d6596a0045ab3a'

* commit 'd8de2ba42679a10db2adc11995d6596a0045ab3a':
  Add a new checkin server flag for Vending Machine client server ping frequency for pending downloads.