Move restricted apps page to new battery optimization page.

New entry: https://screenshot.googleplex.com/BbU6RnQhBbpnBc3.png
Restricted: https://screenshot.googleplex.com/5ggid7TcSsH9CUF.png
Old entry: https://screenshot.googleplex.com/7JgZpSfKs5zZb3Z.png

Bug: 240711616
Test: manual
Change-Id: I03d17beac0fb85a3d17acd7d0d581feb35e9582b

src/com/android/settings/applications/AppBatteryUsagePreferenceController.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 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.
+ */
+
+package com.android.settings.applications;
+
+
+import android.content.Context;
+import android.permission.PermissionControllerManager;
+import android.provider.DeviceConfig;
+
+import androidx.lifecycle.Lifecycle;
+import androidx.lifecycle.LifecycleObserver;
+import androidx.lifecycle.OnLifecycleEvent;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+import com.google.common.annotations.VisibleForTesting;
+
+import java.util.concurrent.Executor;
+
+/**
+ * Preference controller for handling the app battery usage list preference.
+ */
+public final class AppBatteryUsagePreferenceController extends BasePreferenceController
+        implements LifecycleObserver {
+    private static final String TAG = "AppBatteryUsagePreferenceController";
+    private boolean mEnableAppBatteryUsagePage;
+
+    public AppBatteryUsagePreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+        mEnableAppBatteryUsagePage =
+                mContext.getResources().getBoolean(R.bool.config_app_battery_usage_list_enabled);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return mEnableAppBatteryUsagePage ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
+    }
+}