Readd predictive back developer setting

Bug: 315859328
Test: atest BackAnimationPreferenceControllerTest
Test: Verifying that predictive back developer setting is present
Change-Id: I8734a4cb135fbeb0d1787ca2acf569948c08c9ed

res/xml/development_settings.xml

@@ -727,11 +727,10 @@
             android:title="@string/enable_non_resizable_multi_window"
             android:summary="@string/enable_non_resizable_multi_window_summary" />
 
-        // TODO(b/315859328): Temporally removed since causing search indexing failure.
-<!--        <SwitchPreferenceCompat-->
-<!--            android:key="back_navigation_animation"-->
-<!--            android:title="@string/back_navigation_animation"-->
-<!--            android:summary="@string/back_navigation_animation_summary" />-->
+        <SwitchPreferenceCompat
+            android:key="back_navigation_animation"
+            android:title="@string/back_navigation_animation"
+            android:summary="@string/back_navigation_animation_summary" />
 
         <Preference
             android:key="reset_shortcut_manager_throttling"

src/com/android/settings/development/BackAnimationPreferenceController.java

@@ -18,6 +18,7 @@ package com.android.settings.development;
 
 import static com.android.window.flags.Flags.predictiveBackSystemAnimations;
 
+import android.annotation.Nullable;
 import android.content.Context;
 import android.provider.Settings;
 
@@ -28,8 +29,6 @@ import com.android.internal.annotations.VisibleForTesting;
 import com.android.settings.core.PreferenceControllerMixin;
 import com.android.settingslib.development.DeveloperOptionsPreferenceController;
 
-import java.util.Objects;
-
 /**
  * PreferenceController for enabling/disabling animation related to back button and back gestures.
  */
@@ -51,9 +50,8 @@ public class BackAnimationPreferenceController extends DeveloperOptionsPreferenc
 
 
     public BackAnimationPreferenceController(Context context,
-            DevelopmentSettingsDashboardFragment fragment) {
+            @Nullable DevelopmentSettingsDashboardFragment fragment) {
         super(context);
-        Objects.requireNonNull(fragment);
         mFragment = fragment;
     }
 

src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java

@@ -737,7 +737,7 @@ public class DevelopmentSettingsDashboardFragment extends RestrictedDashboardFra
         controllers.add(new OverlaySettingsPreferenceController(context));
         controllers.add(new StylusHandwritingPreferenceController(context));
         controllers.add(new IngressRateLimitPreferenceController((context)));
-        // controllers.add(new BackAnimationPreferenceController(context, fragment));
+        controllers.add(new BackAnimationPreferenceController(context, fragment));
         controllers.add(new PhantomProcessPreferenceController(context));
         controllers.add(new ContrastPreferenceController(
                 context, context.getSystemService(UiModeManager.class)));