Setup basic layout and resources for the accessibility button settings page

cherry picked from commit 93ef33655c

Bug: 173940869
Test: atest AccessibilityButtonFragmentTest
Change-Id: I3f1d8b161d1baadeead36f49f18f00a91fd40b4c
Merged-In: I3f1d8b161d1baadeead36f49f18f00a91fd40b4c

src/com/android/settings/accessibility/AccessibilityButtonFragment.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.accessibility;
+
+import android.app.settings.SettingsEnums;
+import android.content.Context;
+
+import com.android.settings.R;
+import com.android.settings.dashboard.DashboardFragment;
+import com.android.settings.search.BaseSearchIndexProvider;
+import com.android.settingslib.search.SearchIndexable;
+
+/** Settings fragment containing accessibility button properties. */
+@SearchIndexable(forTarget = SearchIndexable.ALL & ~SearchIndexable.ARC)
+public class AccessibilityButtonFragment extends DashboardFragment {
+
+    private static final String TAG = "AccessibilityButtonFragment";
+
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.accessibility_button_settings;
+    }
+
+    @Override
+    public void onAttach(Context context) {
+        super.onAttach(context);
+    }
+
+    @Override
+    protected String getLogTag() {
+        return TAG;
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        return SettingsEnums.ACCESSIBILITY_BUTTON_SETTINGS;
+    }
+
+    public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
+            new BaseSearchIndexProvider(R.xml.accessibility_button_settings);
+}