Add ALLOW_METERED column to DownloadManager.

Also allow isActiveNetworkMetered() to inspect networks without
requiring ACCESS_WIFI_STATE.

Bug: 3001465
Change-Id: Ibc23577d4ad941e4f93db417be6b046881dcbfb1

services/java/com/android/server/ConnectivityService.java

@@ -865,6 +865,9 @@ private NetworkStateTracker makeWimaxStateTracker() {
     @Override
     public NetworkQuotaInfo getActiveNetworkQuotaInfo() {
         enforceAccessPermission();
+
+        final long token = Binder.clearCallingIdentity();
+        try {
             final NetworkState state = getNetworkStateUnchecked(mActiveDefaultNetwork);
             if (state != null) {
                 try {
@@ -873,11 +876,17 @@ private NetworkStateTracker makeWimaxStateTracker() {
                 }
             }
             return null;
+        } finally {
+            Binder.restoreCallingIdentity(token);
+        }
     }
 
     @Override
     public boolean isActiveNetworkMetered() {
         enforceAccessPermission();
+
+        final long token = Binder.clearCallingIdentity();
+        try {
             final NetworkState state = getNetworkStateUnchecked(mActiveDefaultNetwork);
             if (state != null) {
                 try {
@@ -886,6 +895,9 @@ private NetworkStateTracker makeWimaxStateTracker() {
                 }
             }
             return false;
+        } finally {
+            Binder.restoreCallingIdentity(token);
+        }
     }
 
     public boolean setRadios(boolean turnOn) {