message: Make eager/monitoring_test.py less flaky.
  MonitoredTimer measures wall time, so we're susceptible to the process being
  interrupted. To measure time intervals of different lengths, wrap them inside
  each other, that way guaranteeing that the inner one is shorter than the
  outer one.
diff: @@ -104,10 +104,10 @@ class MonitoringTest(test_util.TensorFlowTestCase):
  def test_context_manager(self):
  counter = monitoring.Counter('test/ctxmgr', 'test context manager', 'slot')
  - with monitoring.MonitoredTimer(counter.get_cell('short')):
  - time.sleep(0.001)
  with monitoring.MonitoredTimer(counter.get_cell('long')):
  - time.sleep(0.02)
  + time.sleep(0.01)
  + with monitoring.MonitoredTimer(counter.get_cell('short')):
  + time.sleep(0.01)
  self.assertGreater(
  counter.get_cell('long').value(),
  counter.get_cell('short').value())
  