Add flag to test BpfNetMaps refactoring

Following CLs will switch previous codepath (JNI) and new codepath
(Java) for bpf map operations based on this flag.

Bug: 217624062
Test: atest BpfNetMapsTest
Change-Id: I74f10d5c97390993acea110f6528ef8980bb2aa4

tests/unit/java/com/android/server/BpfNetMapsTest.java

@@ -46,6 +46,7 @@ import static org.junit.Assume.assumeFalse;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.verify;
 
+import android.content.Context;
 import android.net.INetd;
 import android.os.Build;
 import android.os.ServiceSpecificException;
@@ -102,6 +103,7 @@ public final class BpfNetMapsTest {
 
     @Mock INetd mNetd;
     @Mock BpfNetMaps.Dependencies mDeps;
+    @Mock Context mContext;
     private final BpfMap<U32, U32> mConfigurationMap = new TestBpfMap<>(U32.class, U32.class);
     private final BpfMap<U32, UidOwnerValue> mUidOwnerMap =
             new TestBpfMap<>(U32.class, UidOwnerValue.class);
@@ -110,9 +112,10 @@ public final class BpfNetMapsTest {
     public void setUp() throws Exception {
         MockitoAnnotations.initMocks(this);
         doReturn(TEST_IF_INDEX).when(mDeps).getIfIndex(TEST_IF_NAME);
+        BpfNetMaps.setEnableJavaBpfMapForTest(true /* enable */);
         BpfNetMaps.setConfigurationMapForTest(mConfigurationMap);
         BpfNetMaps.setUidOwnerMapForTest(mUidOwnerMap);
-        mBpfNetMaps = new BpfNetMaps(mNetd, mDeps);
+        mBpfNetMaps = new BpfNetMaps(mContext, mNetd, mDeps);
     }
 
     @Test

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

@@ -2061,7 +2061,7 @@ public class ConnectivityServiceTest {
         }
 
         @Override
-        public BpfNetMaps getBpfNetMaps(INetd netd) {
+        public BpfNetMaps getBpfNetMaps(Context context, INetd netd) {
             return mBpfNetMaps;
         }