code: function makeMemcacheSetProto(key, value) {
    var memcacheSetRequest = new apphosting.MemcacheSetRequest();
    var item = new apphosting.MemcacheSetRequest.Item();
    item.setKey(key);
    item.setValue(value);
    item.setSetPolicy(apphosting.MemcacheSetRequest.SetPolicy.SET);
    memcacheSetRequest.addItem(item);
    return memcacheSetRequest;
  }
docs: Return a memcache set request proto.
  
  @param {!string} key key of the item to set
  @param {!string} value value of the item to set
  @return {apphosting.MemcacheSetRequest} a memcache set request proto