Add test size annotation to car tests

Bug:26873938
Change-Id: Ie0d0cb1ea41d77756ac6f88d27d2487245c7957d
diff --git a/tests/libvehiclenetwork-java-test/src/com/android/car/vehiclenetwork/libtest/VehicleNetworkMockedTest.java b/tests/libvehiclenetwork-java-test/src/com/android/car/vehiclenetwork/libtest/VehicleNetworkMockedTest.java
index 78b0ece..7059f7d 100644
--- a/tests/libvehiclenetwork-java-test/src/com/android/car/vehiclenetwork/libtest/VehicleNetworkMockedTest.java
+++ b/tests/libvehiclenetwork-java-test/src/com/android/car/vehiclenetwork/libtest/VehicleNetworkMockedTest.java
@@ -17,6 +17,7 @@
 
 import android.os.HandlerThread;
 import android.test.AndroidTestCase;
+import android.test.suitebuilder.annotation.MediumTest;
 import android.util.Log;
 
 import com.android.car.vehiclenetwork.VehicleNetwork;
@@ -41,6 +42,7 @@
 import java.util.concurrent.Semaphore;
 import java.util.concurrent.TimeUnit;
 
+@MediumTest
 public class VehicleNetworkMockedTest extends AndroidTestCase {
     private static final String TAG = VehicleNetworkMockedTest.class.getSimpleName();