Create new DesktopNavbarButtonsViewController class.

This CL creates a new DesktopNavbarButtonsViewController class to allow
for taskbar buttons and status icons customization on desktop
environment.

Recall: http://recall/clips/e008d2de-36d3-47f6-954a-5ce18bac69a5

Bug: 213964564
Bug: 196757951
Test: Switch between different system navigation modes and verify the
desktop taskbar buttons stay on screen.

Change-Id: Ie7a9a044fad3b60cd37d910b8eb78c8734aadfd5

quickstep/src/com/android/launcher3/taskbar/DesktopNavbarButtonsViewController.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2022 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.launcher3.taskbar;
+
+import static com.android.launcher3.taskbar.TaskbarNavButtonController.BUTTON_NOTIFICATIONS;
+import static com.android.launcher3.taskbar.TaskbarNavButtonController.BUTTON_QUICK_SETTINGS;
+
+import android.view.ViewGroup;
+import android.widget.FrameLayout;
+
+import com.android.launcher3.R;
+
+/**
+ * Controller for managing buttons and status icons in taskbar in a desktop environment.
+ */
+public class DesktopNavbarButtonsViewController extends NavbarButtonsViewController {
+
+    private final TaskbarActivityContext mContext;
+    private final FrameLayout mNavButtonsView;
+    private final ViewGroup mNavButtonContainer;
+
+    private TaskbarControllers mControllers;
+
+    public DesktopNavbarButtonsViewController(TaskbarActivityContext context,
+            FrameLayout navButtonsView) {
+        super(context, navButtonsView);
+        mContext = context;
+        mNavButtonsView = navButtonsView;
+        mNavButtonContainer = mNavButtonsView.findViewById(R.id.end_nav_buttons);
+    }
+
+    /**
+     * Initializes the controller
+     */
+    @Override
+    public void init(TaskbarControllers controllers) {
+        mControllers = controllers;
+        mNavButtonsView.getLayoutParams().height = mContext.getDeviceProfile().taskbarSize;
+
+        // Quick settings and notifications buttons
+        addButton(R.drawable.ic_sysbar_quick_settings, BUTTON_QUICK_SETTINGS,
+                mNavButtonContainer, mControllers.navButtonController,
+                R.id.quick_settings_button);
+        addButton(R.drawable.ic_sysbar_notifications, BUTTON_NOTIFICATIONS,
+                mNavButtonContainer, mControllers.navButtonController,
+                R.id.notifications_button);
+    }
+
+    /** Cleans up on destroy */
+    @Override
+    public void onDestroy() { }
+}