Always displays an option for starting a guest session in the full screen switcher.

If guest is already in the foreground, switcher will just get dimissed upon
the selection of starting a new guest session.

Change-Id: Ia79325a1583f00f35e32e30813163a208acfa0b5
Fixes: 111999338
Fixes: 111453367
Test: Manual in emulator while being logged in as Guest and interacting with the switcher.
diff --git a/packages/SystemUI/res/values/strings_car.xml b/packages/SystemUI/res/values/strings_car.xml
index 61d734f..2890cf2 100644
--- a/packages/SystemUI/res/values/strings_car.xml
+++ b/packages/SystemUI/res/values/strings_car.xml
@@ -19,7 +19,9 @@
 <resources>
     <!-- Name of Guest Profile. [CHAR LIMIT=30] -->
     <string name="car_guest">Guest</string>
-    <!-- Name of Add User Profile. [CHAR LIMIT=30] -->
+    <!-- Title for button that starts a guest session. [CHAR LIMIT=30] -->
+    <string name="start_guest_session">Guest</string>
+    <!-- Title for button that  adds a new user. [CHAR LIMIT=30] -->
     <string name="car_add_user">Add User</string>
     <!-- Default name of the new user created. [CHAR LIMIT=30] -->
     <string name="car_new_user">New User</string>
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/car/FullscreenUserSwitcher.java b/packages/SystemUI/src/com/android/systemui/statusbar/car/FullscreenUserSwitcher.java
index 25a55bd..af0ed284 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/car/FullscreenUserSwitcher.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/car/FullscreenUserSwitcher.java
@@ -101,7 +101,8 @@
             hideUserGrid();
         }
 
-        if (record.mIsForeground) {
+        if (record.mIsForeground || (record.mIsStartGuestSession
+                && mUserManagerHelper.foregroundUserIsGuestUser())) {
             dismissKeyguard();
             return;
         }
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/car/UserGridRecyclerView.java b/packages/SystemUI/src/com/android/systemui/statusbar/car/UserGridRecyclerView.java
index 257fa75..23724c2 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/car/UserGridRecyclerView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/car/UserGridRecyclerView.java
@@ -109,14 +109,12 @@
             userRecords.add(record);
         }
 
-        // Add guest user record if the foreground user is not a guest
-        if (!mUserManagerHelper.foregroundUserIsGuestUser()) {
-            userRecords.add(addGuestUserRecord());
-        }
+        // Add button for starting guest session.
+        userRecords.add(createStartGuestUserRecord());
 
         // Add add user record if the foreground user can add users
         if (mUserManagerHelper.foregroundUserCanAddUsers()) {
-            userRecords.add(addUserRecord());
+            userRecords.add(createAddUserRecord());
         }
 
         return userRecords;
@@ -125,17 +123,17 @@
     /**
      * Create guest user record
      */
-    private UserRecord addGuestUserRecord() {
+    private UserRecord createStartGuestUserRecord() {
         UserInfo userInfo = new UserInfo();
-        userInfo.name = mContext.getString(R.string.car_guest);
-        return new UserRecord(userInfo, true /* isStartGuestSession */,
-                false /* isAddUser */, false /* isForeground */);
+        userInfo.name = mContext.getString(R.string.start_guest_session);
+        return new UserRecord(userInfo, true /* isStartGuestSession */, false /* isAddUser */,
+                false /* isForeground */);
     }
 
     /**
      * Create add user record
      */
-    private UserRecord addUserRecord() {
+    private UserRecord createAddUserRecord() {
         UserInfo userInfo = new UserInfo();
         userInfo.name = mContext.getString(R.string.car_add_user);
         return new UserRecord(userInfo, false /* isStartGuestSession */,
@@ -210,8 +208,6 @@
                     return;
                 }
 
-
-                // If the user selects Guest, start the guest session.
                 if (userRecord.mIsStartGuestSession) {
                     notifyUserSelected(userRecord);
                     mUserManagerHelper.startNewGuestSession(mGuestName);