Improve multi user settings screen

- Added switch and user delete functionality to details screen.
- Added robo tests.

Screenshots: http://shortn/_S6fbIMhAYO
Bug: 142798722
Test: Run robo tests with this command:
  make -j64 RunSettingsRoboTests ROBOTEST_FILTER="com.android.settings.users.*SettingsTest"
Change-Id: Id51c12c5470e30e2dffe93f3bd8c22380d8bdc1f

tests/robotests/src/com/android/settings/testutils/shadow/ShadowUserManager.java

@@ -18,6 +18,7 @@ package com.android.settings.testutils.shadow;
 
 import android.annotation.UserIdInt;
 import android.content.pm.UserInfo;
+import android.os.Bundle;
 import android.os.UserHandle;
 import android.os.UserManager;
 import android.os.UserManager.EnforcingUser;
@@ -43,13 +44,18 @@ public class ShadowUserManager extends org.robolectric.shadows.ShadowUserManager
 
     private static boolean sIsSupportsMultipleUsers;
 
-    private final List<String> mRestrictions = new ArrayList<>();
+    private final List<String> mBaseRestrictions = new ArrayList<>();
+    private final List<String> mUserRestrictions = new ArrayList<>();
+    private final List<String> mGuestRestrictions = new ArrayList<>();
     private final Map<String, List<EnforcingUser>> mRestrictionSources = new HashMap<>();
     private final List<UserInfo> mUserProfileInfos = new ArrayList<>();
     private final Set<Integer> mManagedProfiles = new HashSet<>();
     private boolean mIsQuietModeEnabled = false;
     private int[] profileIdsForUser = new int[0];
     private boolean mUserSwitchEnabled;
+
+    private @UserManager.UserSwitchabilityResult int mSwitchabilityStatus =
+            UserManager.SWITCHABILITY_STATUS_OK;
     private final Map<Integer, Integer> mSameProfileGroupIds = Maps.newHashMap();
 
     public void addProfile(UserInfo userInfo) {
@@ -82,11 +88,32 @@ public class ShadowUserManager extends org.robolectric.shadows.ShadowUserManager
 
     @Implementation
     protected boolean hasBaseUserRestriction(String restrictionKey, UserHandle userHandle) {
-        return mRestrictions.contains(restrictionKey);
+        return mBaseRestrictions.contains(restrictionKey);
     }
 
     public void addBaseUserRestriction(String restriction) {
-        mRestrictions.add(restriction);
+        mBaseRestrictions.add(restriction);
+    }
+
+    @Implementation
+    protected boolean hasUserRestriction(@UserManager.UserRestrictionKey String restrictionKey,
+            UserHandle userHandle) {
+        return mUserRestrictions.contains(restrictionKey);
+    }
+
+    public void addUserRestriction(String restriction) {
+        mUserRestrictions.add(restriction);
+    }
+
+    @Implementation
+    protected Bundle getDefaultGuestRestrictions() {
+        Bundle bundle = new Bundle();
+        mGuestRestrictions.forEach(restriction -> bundle.putBoolean(restriction, true));
+        return bundle;
+    }
+
+    public void addGuestUserRestriction(String restriction) {
+        mGuestRestrictions.add(restriction);
     }
 
     public static ShadowUserManager getShadow() {
@@ -166,4 +193,21 @@ public class ShadowUserManager extends org.robolectric.shadows.ShadowUserManager
     public void setSupportsMultipleUsers(boolean supports) {
         sIsSupportsMultipleUsers = supports;
     }
+
+    @Implementation
+    protected UserInfo getUserInfo(@UserIdInt int userId) {
+        return mUserProfileInfos.stream()
+                .filter(userInfo -> userInfo.id == userId)
+                .findFirst()
+                .orElse(super.getUserInfo(userId));
+    }
+
+    @Implementation
+    protected @UserManager.UserSwitchabilityResult int getUserSwitchability() {
+        return mSwitchabilityStatus;
+    }
+
+    public void setSwitchabilityStatus(@UserManager.UserSwitchabilityResult int newStatus) {
+        mSwitchabilityStatus = newStatus;
+    }
 }