Extract the mapping of flags to APIs.

This CL creates a binary that extracts flagged APIs from an API
signature file, and writes the mapping of flags to APIs to a pb file.

Bug: 311059624
Test: mmm -j frameworks/base/api/coverage/tools/:extract-flagged-apis
      extract-flagged-apis <input api.text file> <output pb file>
Change-Id: I9b6f45bd126cd6a5b2ed1e9f83bdaa12dd580480
diff --git a/api/coverage/tools/Android.bp b/api/coverage/tools/Android.bp
new file mode 100644
index 0000000..3e16912
--- /dev/null
+++ b/api/coverage/tools/Android.bp
@@ -0,0 +1,32 @@
+// 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.
+
+java_binary_host {
+    name: "extract-flagged-apis",
+    srcs: ["ExtractFlaggedApis.kt"],
+    main_class: "android.platform.coverage.ExtractFlaggedApisKt",
+    static_libs: [
+        "metalava-signature-reader",
+        "extract_flagged_apis_proto",
+    ],
+}
+
+java_library_host {
+    name: "extract_flagged_apis_proto",
+    srcs: ["extract_flagged_apis.proto"],
+    static_libs: ["libprotobuf-java-full"],
+    proto: {
+        type: "full",
+    },
+}