Add support for visualizing secondary users.

This functionality adds the secondary users to the screen, but
currently does not populate the information for them. Once the
external stats query works, I will add a loader which will
populate this information.

This also does not cover work profiles. Support for that is
forthcoming.

Bug: 34715777, 34225103
Test: Settings Robotest
Change-Id: Ib9b692b214f5ce5d303dfd64516381443d4acebd

src/com/android/settings/applications/UserManagerWrapperImpl.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2017 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.applications;
+
+import android.content.pm.UserInfo;
+import android.os.UserManager;
+
+import java.util.List;
+
+public class UserManagerWrapperImpl implements UserManagerWrapper {
+    private UserManager mUserManager;
+
+    public UserManagerWrapperImpl(UserManager userManager) {
+        mUserManager = userManager;
+    }
+
+    @Override
+    public UserInfo getPrimaryUser() {
+        return mUserManager.getPrimaryUser();
+    }
+
+    @Override
+    public List<UserInfo> getUsers() {
+        return mUserManager.getUsers();
+    }
+}