Include elapsed realtime (nanos) of the event in the radio state change notifications.

Bug: 13247811
Change-Id: I3454aa159a68b9087b4762df947b41965b5a3941
diff --git a/core/java/android/net/INetworkManagementEventObserver.aidl b/core/java/android/net/INetworkManagementEventObserver.aidl
index 5b16f8b..dd9c39f 100644
--- a/core/java/android/net/INetworkManagementEventObserver.aidl
+++ b/core/java/android/net/INetworkManagementEventObserver.aidl
@@ -86,8 +86,9 @@
      *
      * @param iface The interface.
      * @param active  True if the interface is actively transmitting data, false if it is idle.
+     * @param tsNanos Elapsed realtime in nanos when the state of the network interface changed.
      */
-    void interfaceClassDataActivityChanged(String label, boolean active);
+    void interfaceClassDataActivityChanged(String label, boolean active, long tsNanos);
 
     /**
      * Information about available DNS servers has been received.