Create JNI layer for Icing

Bug: 146383629
Test: manual 'atest
java/tests/instrumentation/src/com/google/android/icing/IcingSearchEngineTest.java'

Change-Id: I3868ca19a477bd6996f268d2a73a1dc906afaee6
diff --git a/java/Android.bp b/java/Android.bp
new file mode 100644
index 0000000..6bc8836
--- /dev/null
+++ b/java/Android.bp
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 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.
+
+java_library {
+    name: "libicing-java",
+    srcs: ["src/**/*.java"],
+    static_libs: [
+        "icing-java-proto-lite",
+        "libprotobuf-java-lite",
+    ],
+}