Hold wifi and mobile interfaces since boot in NetworkStatsService am: a2f1cf3576

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/18710006

Change-Id: Ie53afd7a2c6cfdd46a1ed3954a1aceac9bd120eb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

framework-t/src/android/net/NetworkStats.java

@@ -1299,6 +1299,17 @@ public final class NetworkStats implements Parcelable, Iterable<NetworkStats.Ent
         return ret;
     }
 
+    /**
+     * Removes the interface name from all entries.
+     * This mutates the original structure in place.
+     * @hide
+     */
+    public void clearInterfaces() {
+        for (int i = 0; i < size; i++) {
+            iface[i] = null;
+        }
+    }
+
     /**
      * Only keep entries that match all specified filters.
      *