Move libnative{bridge,loader} to art/

This change moves system/core/libnative{bridge,loader} under art/.

Bug: 137364733
Test: m
Change-Id: I9be7333d00fcd3f36cd80520e50a30ea840187ad
diff --git a/libnativebridge/tests/NativeBridgeVersion_test.cpp b/libnativebridge/tests/NativeBridgeVersion_test.cpp
new file mode 100644
index 0000000..d3f9a80
--- /dev/null
+++ b/libnativebridge/tests/NativeBridgeVersion_test.cpp
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "NativeBridgeTest.h"
+
+#include <unistd.h>
+
+namespace android {
+
+TEST_F(NativeBridgeTest, Version) {
+    // When a bridge isn't loaded, we expect 0.
+    EXPECT_EQ(NativeBridgeGetVersion(), 0U);
+
+    // After our dummy bridge has been loaded, we expect 1.
+    ASSERT_TRUE(LoadNativeBridge(kNativeBridgeLibrary, nullptr));
+    EXPECT_EQ(NativeBridgeGetVersion(), 1U);
+
+    // Unload
+    UnloadNativeBridge();
+
+    // Version information is gone.
+    EXPECT_EQ(NativeBridgeGetVersion(), 0U);
+}
+
+}  // namespace android