code: func PutPendingCount(c context.Context, master, builder string, count int) error {
  	return datastore.Put(c, &builderEntity{
  		MasterKey:    datastore.MakeKey(c, masterKind, master),
  		Name:         builder,
  		PendingCount: count,
  	})
  }
docs: // PutPendingCount persists number of pending builds to a builder.
  // Useful for testing.