public DSClockTestHook getTestHook() {
    return testHook;
  }
This timer task makes the cache dependent on this DM, to wait (OR in other words stop it's
cacheTimeMillis() to return constant value until System.currentTimeMillis() + newOffset
reaches/crosses over that constant time) for difference between old time offset and new one if
new one is < old one. Because then we need to slow down the cache time aggressively.
geode-core/src/main/java/org/apache/geode/distributed/internal/DSClock.java