Add home controls button to screensaver settings

Toggle will allow users to disable showing home controls over their
screensaver.

Bug: 271330583
Test: make -j64 RunSettingsRoboTests
Change-Id: I9600cdb85d85253c859c88f12c1d074e1082bf97

src/com/android/settings/dream/DreamHomeControlsPreferenceController.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2023 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.dream;
+
+import android.content.Context;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.settings.R;
+import com.android.settings.core.TogglePreferenceController;
+import com.android.settingslib.dream.DreamBackend;
+
+/**
+ * Controller for the {@link androidx.preference.SwitchPreference} which controls if dream
+ * overlays should be enabled.
+ */
+public class DreamHomeControlsPreferenceController extends TogglePreferenceController {
+    private final DreamBackend mBackend;
+
+    public DreamHomeControlsPreferenceController(Context context, String key) {
+        this(context, key, DreamBackend.getInstance(context));
+    }
+
+    @VisibleForTesting
+    public DreamHomeControlsPreferenceController(Context context, String key,
+            DreamBackend dreamBackend) {
+        super(context, key);
+        mBackend = dreamBackend;
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        final boolean supported =
+                mBackend.getSupportedComplications()
+                        .contains(DreamBackend.COMPLICATION_TYPE_HOME_CONTROLS);
+        return supported ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
+    }
+
+    @Override
+    public boolean isChecked() {
+        return mBackend.getEnabledComplications().contains(
+                DreamBackend.COMPLICATION_TYPE_HOME_CONTROLS);
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        mBackend.setHomeControlsEnabled(isChecked);
+        return true;
+    }
+
+    @Override
+    public int getSliceHighlightMenuRes() {
+        return R.string.menu_key_display;
+    }
+}