Add smart battery page for battery settings

This page contains prefs for smart battery and app restriction.

Bug: 71502850
Test: RunSettingsRoboTests

Change-Id: I194af30cbc7b2496b10098fcb67f1116e0722310

res/xml/power_usage_summary.xml

@@ -38,6 +38,11 @@
             android:key="battery_saver_summary"
             android:title="@string/battery_saver"/>
 
+        <Preference
+            android:fragment="com.android.settings.fuelgauge.SmartBatterySettings"
+            android:key="smart_battery_manager"
+            android:title="@string/smart_battery_manager_title"/>
+
         <SwitchPreference
             android:key="battery_percentage"
             android:title="@string/battery_percentage"

res/xml/smart_battery_detail.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2018 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/smart_battery_manager_title">
+
+    <!-- TODO(b/71722498): Add header back, otherwise also remove smart_battery_header
+    <com.android.settings.applications.LayoutPreference
+        android:key="header_view"
+        android:layout="@layout/smart_battery_header"
+        android:selectable="false"
+        android:order="-10000"/>
+     -->
+
+    <SwitchPreference
+        android:key="smart_battery"
+        android:title="@string/smart_battery_title"
+        android:summary="@string/smart_battery_summary"/>
+
+    <Preference
+        android:key="restricted_app"
+        android:title="@string/restricted_app_title"/>
+
+</PreferenceScreen>