Adding ApexInfo utility

This is to get name/version when the HAL is started from an APEX. This
is the initial work and just prints name/version on startup.

Bug: 268439003
Test: adb logcat | grep com.google.android.widevine
Change-Id: I756c042d544f973999738f7d17022d916b9712cd

libwvdrmengine/apex/proto/Android.bp

@@ -0,0 +1,42 @@
+/*
+ * 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: ["Android-Apache-2.0"],
+}
+
+// TODO(b/268439003) The widevine apex wants to get the apex version.
+// Since there's no such API, we read it from apex_manifest.pb directly via
+// a partial view proto.
+// When we have a proper API, we can delete this proto because it should be
+// internal to system.
+cc_library_static {
+    name: "lib_apex_manifest_minimal_proto_lite",
+    proto: {
+        type: "lite",
+    },
+    export_include_dirs: [
+        ".",
+    ],
+    srcs: [
+        "apex_manifest_minimal.proto",
+        "widevine_apex_info.cpp",
+    ],
+    shared_libs: [
+        "libbase",
+    ],
+    vendor: true,
+}