Integrate system language filtering functionality

Filter system languages based on the configuration provided via
the corresponding system property.

Bug: 154133013
Test: manual; atest LocalizationTest
Change-Id: I7e4694f4b381ab81d0e8ceab97bad68bb266aaee

core/sysprop/Android.bp

@@ -0,0 +1,21 @@
+// Copyright (C) 2020 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.
+
+sysprop_library {
+    name: "com.android.sysprop.localization",
+    srcs: ["LocalizationProperties.sysprop"],
+    property_owner: "Platform",
+    api_packages: ["android.sysprop"],
+    vendor_available: false,
+}

core/sysprop/LocalizationProperties.sysprop

@@ -0,0 +1,24 @@
+# Copyright (C) 2020 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.
+
+module: "android.sysprop.LocalizationProperties"
+owner: Platform
+
+prop {
+    api_name: "locale_filter"
+    type: String
+    prop_name: "ro.localization.locale_filter"
+    scope: Internal
+    access: Readonly
+}

core/sysprop/api/com.android.sysprop.localization-current.txt

@@ -0,0 +1,9 @@
+props {
+  module: "android.sysprop.LocalizationProperties"
+  prop {
+    api_name: "locale_filter"
+    type: String
+    scope: Internal
+    prop_name: "ro.localization.locale_filter"
+  }
+}

core/sysprop/api/com.android.sysprop.localization-latest.txt

@@ -0,0 +1,9 @@
+props {
+  module: "android.sysprop.LocalizationProperties"
+  prop {
+    api_name: "locale_filter"
+    type: String
+    scope: Internal
+    prop_name: "ro.localization.locale_filter"
+  }
+}