Create settings page for choosing default Network Scorer.

Bug: 35203304
Bug: 35852687
Test: make RunSettingsRoboTests -j40
Change-Id: Iaef671e0a9e8beb560e1d2c9864f44ef46993a6b
diff --git a/res/xml/network_scorer_picker_prefs.xml b/res/xml/network_scorer_picker_prefs.xml
new file mode 100644
index 0000000..fab69e7
--- /dev/null
+++ b/res/xml/network_scorer_picker_prefs.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2017 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.
+  -->
+
+<PreferenceScreen
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        android:title="@string/network_scorer_picker_title">
+</PreferenceScreen>
\ No newline at end of file