[MS61] Remove NetworkManagementSocketTagger#install dependency

Expose TrafficStats#attachSocketTagger and use it instead.

Test: atest TrafficStatsTest
Bug: 204830222
CTS-Coverage-Bug: 214979748
Change-Id: I1748d349b499053ad08bd62202325fa759ad8da5

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

@@ -16,6 +16,8 @@
 
 package android.net;
 
+import static android.annotation.SystemApi.Client.MODULE_LIBRARIES;
+
 import android.annotation.NonNull;
 import android.annotation.SuppressLint;
 import android.annotation.SystemApi;
@@ -213,6 +215,18 @@ public class TrafficStats {
         sStatsService = statsManager.getBinder();
     }
 
+    /**
+     * Attach the socket tagger implementation to the current process, to
+     * get notified when a socket's {@link FileDescriptor} is assigned to
+     * a thread. See {@link SocketTagger#set(SocketTagger)}.
+     *
+     * @hide
+     */
+    @SystemApi(client = MODULE_LIBRARIES)
+    public static void attachSocketTagger() {
+        NetworkManagementSocketTagger.install();
+    }
+
     /**
      * Set active tag to use when accounting {@link Socket} traffic originating
      * from the current thread. Only one active tag per thread is supported.