Add Apps > Battery optimization page implementation.

Moving the old restricted page to the new optimization page will happen
in a follow-up CL.

Test: Unit, manual
Bug: 238026672
Change-Id: I5fee9ebe03284a013da6bfca9ada8b166c6af91c
diff --git a/src/com/android/settings/Settings.java b/src/com/android/settings/Settings.java
index c3ab8e2..f7ba017 100644
--- a/src/com/android/settings/Settings.java
+++ b/src/com/android/settings/Settings.java
@@ -326,6 +326,8 @@
     public static class ChangeWifiStateActivity extends SettingsActivity { /* empty */ }
     public static class AppDrawOverlaySettingsActivity extends SettingsActivity { /* empty */ }
     public static class AppWriteSettingsActivity extends SettingsActivity { /* empty */ }
+    /** Activity to manage app battery optimization details. */
+    public static class AppBatteryOptimizationActivity extends SettingsActivity { /* empty */ }
 
     public static class ManageExternalSourcesActivity extends SettingsActivity {/* empty */ }
     public static class ManageAppExternalSourcesActivity extends SettingsActivity { /* empty */ }