Add a sentinel Android.bp in external/protobuf/java

bp2build will create a proto_library target in the generated BUILD.bazel
file so that we can build bazel equivalents of soong modules that use
external/protobuf/java as proto.include_dir

The alternative would have been to reuse the checked-in
external/protobuf/java/BUILD.bazel file, but that would require
addressing the following issues
- Converting this project to an external workspace for android builds.
  (e.g. the BUILD files in this directory refer //java/util which is
  relative to this workspace and not relative to the primary android
  bazel workspace)
- Forking some BUILD.bazel files (we will need export_files for the
  top-level external/protobuf/Android.bp files)
- Importing (or creating shims of) transtive deps like rules_pkg

Test: Allowlisted an internal soong module that uses .proto from this
dir and verified that a
proto_library is created in
out/soong/workspace/external/protobuf/java/BUILD.bazel
Bug: 290345526

Change-Id: Ic70763ff3583a9c43357c45baac2687c68e6d66d

1 files changed, 17 insertions, 0 deletions

diff --git a/java/Android.bp b/java/Android.bp
new file mode 100644
index 000000000..877467e6b
--- /dev/null
+++ b/java/Android.bp
@@ -0,0 +1,17 @@
+// Copyright (C) 2023 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.
+
+package {
+    default_applicable_licenses: ["external_protobuf_license"],
+}