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/libnativebridge.map.txt b/libnativebridge/libnativebridge.map.txt
new file mode 100644
index 0000000..a6841a3
--- /dev/null
+++ b/libnativebridge/libnativebridge.map.txt
@@ -0,0 +1,45 @@
+#
+# Copyright (C) 2019 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.
+#
+
+# TODO(b/122710865): Most of these uses come from libnativeloader, which should be bundled
+# together with libnativebridge in the APEX. Once this happens, prune this list.
+LIBNATIVEBRIDGE_1 {
+  global:
+    NativeBridgeIsSupported;
+    NativeBridgeLoadLibrary;
+    NativeBridgeUnloadLibrary;
+    NativeBridgeGetError;
+    NativeBridgeIsPathSupported;
+    NativeBridgeCreateNamespace;
+    NativeBridgeGetExportedNamespace;
+    NativeBridgeLinkNamespaces;
+    NativeBridgeLoadLibraryExt;
+    NativeBridgeInitAnonymousNamespace;
+    NativeBridgeInitialized;
+    NativeBridgeGetTrampoline;
+    LoadNativeBridge;
+    PreInitializeNativeBridge;
+    InitializeNativeBridge;
+    NativeBridgeGetVersion;
+    NativeBridgeGetSignalHandler;
+    UnloadNativeBridge;
+    NativeBridgeAvailable;
+    NeedsNativeBridge;
+    NativeBridgeError;
+    NativeBridgeNameAcceptable;
+  local:
+    *;
+};