StatsEventParcel impl.; move AIDL files

This implementation continue to uses libbinder, as opposed to
libbinder_ndk.

We also move many (but not all) statsd aidl files from
frameworks/base/core into the apex.

Test: m -j128 && bit statsd_test:*
Change-Id: I95f06e937e50c1e2a638163b13587682402956a7
diff --git a/apex/statsd/aidl/Android.bp b/apex/statsd/aidl/Android.bp
new file mode 100644
index 0000000..e6ca544
--- /dev/null
+++ b/apex/statsd/aidl/Android.bp
@@ -0,0 +1,35 @@
+//
+// Copyright (C) 2019 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.
+//
+
+// TODO(b/145815909): move StatsDimensionsValue.aidl and StatsLogEventWrapper.aidl here
+filegroup {
+    name: "statsd_aidl",
+    srcs: ["**/*.aidl"],
+}
+
+// This library is currently unused
+aidl_interface {
+    name: "stats-event-parcel-aidl",
+    srcs: ["android/util/StatsEventParcel.aidl"],
+    backend: {
+        java: {
+            sdk_version: "28",
+        },
+        cpp: {
+            enabled: false,
+        }
+    }
+}