Move Styles & wallpapers to the homepage group

- Add Styles & wallpapers to the homepage group.
- Create a new display settings xml for the silky home.
- Remove Styles & wallpapers from new display settings xml.
- Apply the RestrictedTopLevelPreference to remove the restricted icon.

Bug: 168166015
Bug: 174964139
Test: robotest & visual with turning on/off silky home
Change-Id: Ib495b39bc62413242247f7e767c0e44bacc6e937

src/com/android/settings/DisplaySettings.java

@@ -19,7 +19,10 @@ package com.android.settings;
 import android.app.settings.SettingsEnums;
 import android.content.Context;
 import android.os.Bundle;
+import android.provider.SearchIndexableResource;
+import android.util.FeatureFlagUtils;
 
+import com.android.settings.core.FeatureFlags;
 import com.android.settings.dashboard.DashboardFragment;
 import com.android.settings.display.BrightnessLevelPreferenceController;
 import com.android.settings.display.CameraGesturePreferenceController;
@@ -37,6 +40,7 @@ import com.android.settingslib.core.lifecycle.Lifecycle;
 import com.android.settingslib.search.SearchIndexable;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 
 @SearchIndexable(forTarget = SearchIndexable.ALL & ~SearchIndexable.ARC)
@@ -55,6 +59,9 @@ public class DisplaySettings extends DashboardFragment {
 
     @Override
     protected int getPreferenceScreenResId() {
+        if (FeatureFlagUtils.isEnabled(getContext(), FeatureFlags.SILKY_HOME)) {
+            return R.xml.display_settings_v2;
+        }
         return R.xml.display_settings;
     }
 
@@ -90,7 +97,16 @@ public class DisplaySettings extends DashboardFragment {
     }
 
     public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
-            new BaseSearchIndexProvider(R.xml.display_settings) {
+            new BaseSearchIndexProvider() {
+
+                @Override
+                public List<SearchIndexableResource> getXmlResourcesToIndex(
+                        Context context, boolean enabled) {
+                    final SearchIndexableResource sir = new SearchIndexableResource(context);
+                    sir.xmlResId = FeatureFlagUtils.isEnabled(context, FeatureFlags.SILKY_HOME)
+                            ? R.xml.display_settings_v2 : R.xml.display_settings;
+                    return Arrays.asList(sir);
+                }
 
                 @Override
                 public List<AbstractPreferenceController> createPreferenceControllers(