API to report if active network is metered.

Report to developers if active network is "metered" and define it
as the user being sensitive to heavy data usage.

Bug: 3001465
Change-Id: I855ca3cd3eb1de3c4814148d70ccf24957af898a
diff --git a/core/java/android/net/IConnectivityManager.aidl b/core/java/android/net/IConnectivityManager.aidl
index 7046008..92aeff2 100644
--- a/core/java/android/net/IConnectivityManager.aidl
+++ b/core/java/android/net/IConnectivityManager.aidl
@@ -51,6 +51,7 @@
     NetworkState[] getAllNetworkState();
 
     NetworkQuotaInfo getActiveNetworkQuotaInfo();
+    boolean isActiveNetworkMetered();
 
     boolean setRadios(boolean onOff);