[VCN11] Make requestBackgroundNetwork requires handler

Test: atest FrameworksNetTests android.net.cts.ConnectivityManagerTest
Bug: 175662146
Change-Id: Iac9487e8de8bfdd87fc7a0153b228ae2a7ba4e19

tests/net/java/com/android/server/ConnectivityServiceTest.java

@@ -4027,7 +4027,8 @@ public class ConnectivityServiceTest {
         grantUsingBackgroundNetworksPermissionForUid(Binder.getCallingUid());
         final TestNetworkCallback cellBgCallback = new TestNetworkCallback();
         mCm.requestBackgroundNetwork(new NetworkRequest.Builder()
-                .addTransportType(TRANSPORT_CELLULAR).build(), null, cellBgCallback);
+                .addTransportType(TRANSPORT_CELLULAR).build(),
+                mCsHandlerThread.getThreadHandler(), cellBgCallback);
 
         // Make callbacks for monitoring.
         final NetworkRequest request = new NetworkRequest.Builder().build();