Make kubelet report usageNanoCores for node on Windows

pkg/kubelet/winstats/perfcounters.go

@@ -34,6 +34,10 @@ const (
 	// Perf counters are updated every second. This is the same as the default cadvisor collection period
 	// see https://github.com/google/cadvisor/blob/master/docs/runtime_options.md#housekeeping
 	perfCounterUpdatePeriod = 1 * time.Second
+	// defaultCachePeriod is the default cache period for each cpuUsage.
+	// This matches with the cadvisor setting and the time interval we use for containers.
+	// see https://github.com/kubernetes/kubernetes/blob/master/pkg/kubelet/cadvisor/cadvisor_linux.go#L63
+	defaultCachePeriod = 10 * time.Second
 )
 
 type perfCounter struct {