Reapply "Support toggling Taskbar All Apps with 3P Launcher." am: 036a83cd99

The revert was not supposed to be auto-merged.

This reverts commit 5a3bf93d82, reversing
changes made to 84f8002586.

Bug: 331384026
Change-Id: Ieb11a8544db90259aae856c4af805c37ce9e68cc

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

@@ -197,6 +197,11 @@ public class TaskbarUIController {
         return false;
     }
 
+    /** Returns {@code true} if Home All Apps available instead of Taskbar All Apps. */
+    protected boolean canToggleHomeAllApps() {
+        return false;
+    }
+
     @CallSuper
     protected void dumpLogs(String prefix, PrintWriter pw) {
         pw.println(String.format(