Create platformtestprotos.

This target contains some proto definitions used by TradeFed. TF will
use this instead of platformprotos to reduce proto dependencies on the
platform.

A separate build file is created so its ownership is managed separately.
The OWNERS file will be updated due to merge conflicts.

Bug: 181921006
Test: New target builds.
Change-Id: I87e7a73d1160e3cf56a4c013e74989cdc90e1211
Merged-In: I82386a6c8a5e6ddf42d8377148001f4ede2f297f

Android.bp

@@ -528,4 +528,5 @@ build = [
     "StubLibraries.bp",
     "ApiDocs.bp",
     "ProtoLibraries.bp",
+    "TestProtoLibraries.bp",
 ]

TestProtoLibraries.bp

@@ -0,0 +1,35 @@
+// Copyright 2021 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_host {
+    name: "platformtestprotos",
+    srcs: [
+        ":libstats_atom_enum_protos",
+        ":libstats_internal_protos",
+        ":statsd_internal_protos",
+    ],
+    libs: [
+        "libprotobuf-java-full",
+    ],
+    proto: {
+        include_dirs: [
+            "external/protobuf/src",
+            "frameworks/proto_logging/stats",
+        ],
+        type: "full",
+    },
+    errorprone: {
+        javacflags: ["-Xep:MissingOverride:OFF"], // b/72714520
+    },
+}