ash: Replace SessionStateDelegate::CanAddUserToMultiProfile

ash/common/system/user/user_view.cc

Index: ash/common/system/user/user_view.cc
diff --git a/ash/common/system/user/user_view.cc b/ash/common/system/user/user_view.cc
index ac07e180f01c6076d72e0e7896f57fffbf9f076f..b2f17ddd5299e839c1d577643fdcfcfbd56b67c0 100644
--- a/ash/common/system/user/user_view.cc
+++ b/ash/common/system/user/user_view.cc
@@ -29,7 +29,6 @@
 #include "ash/common/wm_window.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/resources/vector_icons/vector_icons.h"
-#include "base/optional.h"
 #include "components/signin/core/account_id/account_id.h"
 #include "components/user_manager/user_info.h"
 #include "grit/ash_resources.h"
@@ -105,39 +104,40 @@ bool IsMultiProfileSupportedAndUserActive() {
 }
 
 // Creates the view shown in the user switcher popup ("AddUserMenuOption").
-views::View* CreateAddUserView(
-    base::Optional<SessionStateDelegate::AddUserError> error) {
+views::View* CreateAddUserView(AddUserSessionPolicy policy) {
   DCHECK(UseMd());
   auto view = new views::View;
   auto layout = new views::BoxLayout(
       views::BoxLayout::kHorizontal, (kMenuButtonSize - kMenuIconSize) / 2,
       kMenuSeparatorVerticalPadding, kTrayPopupPaddingBetweenItems);
   layout->set_minimum_cross_axis_size(
-      error ? 56 : GetTrayConstant(TRAY_POPUP_ITEM_MIN_HEIGHT));
+      policy == AddUserSessionPolicy::ALLOWED
+          ? GetTrayConstant(TRAY_POPUP_ITEM_MIN_HEIGHT)
+          : 56);
   view->SetLayoutManager(layout);
   view->set_background(
       views::Background::CreateSolidBackground(kBackgroundColor));
 
-  if (!error) {
-    auto icon = new views::ImageView();
-    icon->SetImage(
-        gfx::CreateVectorIcon(kSystemMenuNewUserIcon, kMenuIconColor));
-    view->AddChildView(icon);
-  }
+  int message_id = 0;
+  switch (policy) {
+    case AddUserSessionPolicy::ALLOWED: {
+      message_id = IDS_ASH_STATUS_TRAY_SIGN_IN_ANOTHER_ACCOUNT;
 
-  int message_id = IDS_ASH_STATUS_TRAY_SIGN_IN_ANOTHER_ACCOUNT;
-  if (error) {
-    switch (*error) {
-      case SessionStateDelegate::ADD_USER_ERROR_NOT_ALLOWED_PRIMARY_USER:
-        message_id = IDS_ASH_STATUS_TRAY_MESSAGE_NOT_ALLOWED_PRIMARY_USER;
-        break;
-      case SessionStateDelegate::ADD_USER_ERROR_MAXIMUM_USERS_REACHED:
-        message_id = IDS_ASH_STATUS_TRAY_MESSAGE_CANNOT_ADD_USER;
-        break;
-      case SessionStateDelegate::ADD_USER_ERROR_OUT_OF_USERS:
-        message_id = IDS_ASH_STATUS_TRAY_MESSAGE_OUT_OF_USERS;
-        break;
+      auto icon = new views::ImageView();
+      icon->SetImage(
+          gfx::CreateVectorIcon(kSystemMenuNewUserIcon, kMenuIconColor));
+      view->AddChildView(icon);
+      break;
     }
+    case AddUserSessionPolicy::ERROR_NOT_ALLOWED_PRIMARY_USER:
+      message_id = IDS_ASH_STATUS_TRAY_MESSAGE_NOT_ALLOWED_PRIMARY_USER;
+      break;
+    case AddUserSessionPolicy::ERROR_MAXIMUM_USERS_REACHED:
+      message_id = IDS_ASH_STATUS_TRAY_MESSAGE_CANNOT_ADD_USER;
+      break;
+    case AddUserSessionPolicy::ERROR_NO_ELIGIBLE_USERS:
+      message_id = IDS_ASH_STATUS_TRAY_MESSAGE_OUT_OF_USERS;
+      break;
   }
 
   auto command_label = new views::Label(l10n_util::GetStringUTF16(message_id));
@@ -604,15 +604,13 @@ void UserView::ToggleAddUserMenuOption() {
 
   const SessionStateDelegate* delegate =
       WmShell::Get()->GetSessionStateDelegate();
-  SessionStateDelegate::AddUserError add_user_error;
-  add_user_enabled_ = delegate->CanAddUserToMultiProfile(&add_user_error);
+  const AddUserSessionPolicy add_user_policy =
+      delegate->GetAddUserSessionPolicy();
+  add_user_enabled_ = add_user_policy == AddUserSessionPolicy::ALLOWED;
 
   if (UseMd()) {
-    base::Optional<SessionStateDelegate::AddUserError> error;
-    if (!add_user_enabled_)
-      error = add_user_error;
     ButtonFromView* button = new ButtonFromView(
-        CreateAddUserView(error), add_user_enabled_ ? this : nullptr,
+        CreateAddUserView(add_user_policy), add_user_enabled_ ? this : nullptr,
         IsActiveUser() ? TrayPopupInkDropStyle::INSET_BOUNDS
                        : TrayPopupInkDropStyle::FILL_BOUNDS,
         false, gfx::Insets());
@@ -680,18 +678,19 @@ void UserView::ToggleAddUserMenuOption() {
     } else {
       ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
       int message_id = 0;
-      switch (add_user_error) {
-        case SessionStateDelegate::ADD_USER_ERROR_NOT_ALLOWED_PRIMARY_USER:
+      switch (add_user_policy) {
+        case AddUserSessionPolicy::ERROR_NOT_ALLOWED_PRIMARY_USER:
           message_id = IDS_ASH_STATUS_TRAY_MESSAGE_NOT_ALLOWED_PRIMARY_USER;
           break;
-        case SessionStateDelegate::ADD_USER_ERROR_MAXIMUM_USERS_REACHED:
+        case AddUserSessionPolicy::ERROR_MAXIMUM_USERS_REACHED:
           message_id = IDS_ASH_STATUS_TRAY_MESSAGE_CANNOT_ADD_USER;
           break;
-        case SessionStateDelegate::ADD_USER_ERROR_OUT_OF_USERS:
+        case AddUserSessionPolicy::ERROR_NO_ELIGIBLE_USERS:
           message_id = IDS_ASH_STATUS_TRAY_MESSAGE_OUT_OF_USERS;
           break;
         default:
-          NOTREACHED() << "Unknown adding user error " << add_user_error;
+          NOTREACHED() << "Unknown adding user policy "
+                       << static_cast<int>(add_user_policy);
       }
 
       popup_message_.reset(new PopupMessage(