@Override
    protected KeyValueHeap newKVHeap(List<? extends KeyValueScanner> scanners,
      CellComparator comparator) throws IOException {
      return new KeyValueHeapWithCount(scanners, comparator, count);
    }
A StoreScanner for our CELL_GRID above. Fakes the block transitions. Does counts of calls to
optimize and counts of when optimize actually did an optimize.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestStoreScanner.java