@Override
    public long currentTime() {
      return t;
    }
Inserts a new region's meta information into the passed <code>meta</code> region.
@param meta hbase:meta HRegion to be updated
@param r    HRegion to add to <code>meta</code>
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestDefaultMemStore.java