Cherish: Import BasePreferenceController and DashboardFragment from Krypton

Signed-off-by: Hưng Phan <phandinhhungvp2001@gmail.com>

res/menu/app_list_menu.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2021 AOSP-Krypton 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.
+-->
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <item
+        android:id="@+id/search"
+        android:title="@string/search"
+        android:icon="@drawable/ic_find_in_page_24px"
+        android:showAsAction="ifRoom|collapseActionView"
+        android:actionViewClass="android.widget.SearchView" />
+</menu>