User switcher in now checks for whether the user can switch to other

users.

If a user is not allowed to switch to other users, they will only see themselves
in the switcher.

Change-Id: I0f92696e8500298bfce023ff67953d110c86edf1
Fixes:110900364
Fixes:110697332
Test: Manual in mojave in both users with and without switch restriction
(cherry picked from commit 9973fffba735fcaa4e3703b8d8fd5be4e33f6284)

packages/SystemUI/src/com/android/systemui/statusbar/car/UserGridRecyclerView.java

@@ -98,6 +98,13 @@ public class UserGridRecyclerView extends PagedListView implements
 
     private List<UserRecord> createUserRecords(List<UserInfo> userInfoList) {
         List<UserRecord> userRecords = new ArrayList<>();
+
+        // If the foreground user CANNOT switch to other users, only display the foreground user.
+        if (!mCarUserManagerHelper.canForegroundUserSwitchUsers()) {
+            userRecords.add(createForegroundUserRecord());
+            return userRecords;
+        }
+
         for (UserInfo userInfo : userInfoList) {
             if (userInfo.isGuest()) {
                 // Don't display guests in the switcher.
@@ -122,6 +129,11 @@ public class UserGridRecyclerView extends PagedListView implements
         return userRecords;
     }
 
+    private UserRecord createForegroundUserRecord() {
+        return new UserRecord(mCarUserManagerHelper.getCurrentForegroundUserInfo(),
+                false /* isStartGuestSession */, false /* isAddUser */, true /* isForeground */);
+    }
+
     /**
      * Create guest user record
      */