void add(BlobId blobId) {
      if (blobIdToContinuationTokenMap.containsKey(blobId)) {
        continuationTokenToBlobIdMap.put(blobIdToContinuationTokenMap.get(blobId), null);
      }
      continuationTokenToBlobIdMap.put(Integer.toString(++continuationTokenCounter), blobId);
      blobIdToContinuationTokenMap.put(blobId, Integer.toString(continuationTokenCounter));
    }
Add a blobid to the change feed.
@param blobId {@link BlobId} to add.
ambry-vcr/src/test/java/com/github/ambry/vcr/LatchBasedInMemoryCloudDestination.java