ash: Use enum for SessionController::CycleActiveUser

ash/public/interfaces/session_controller_traits.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_PUBLIC_INTERFACES_SESSION_CONTROLLER_TRAITS_H_
 #define ASH_PUBLIC_INTERFACES_SESSION_CONTROLLER_TRAITS_H_
 
 #include "ash/public/cpp/session_types.h"
 #include "ash/public/interfaces/session_controller.mojom.h"
 #include "components/session_manager/session_manager_types.h"
@@ skipping 147 matching lines @@
         return true;
       case ash::mojom::AddUserSessionPolicy::ERROR_MAXIMUM_USERS_REACHED:
         *out = ash::AddUserSessionPolicy::ERROR_MAXIMUM_USERS_REACHED;
         return true;
     }
     NOTREACHED();
     return false;
   }
 };
 
+template <>
+struct EnumTraits<ash::mojom::CycleUserDirection, ash::CycleUserDirection> {
+  static ash::mojom::CycleUserDirection ToMojom(ash::CycleUserDirection input) {
+    switch (input) {
+      case ash::CycleUserDirection::NEXT:
+        return ash::mojom::CycleUserDirection::NEXT;
+      case ash::CycleUserDirection::PREVIOUS:
+        return ash::mojom::CycleUserDirection::PREVIOUS;
+    }
+    NOTREACHED();
+    return ash::mojom::CycleUserDirection::NEXT;
+  }
+
+  static bool FromMojom(ash::mojom::CycleUserDirection input,
+                        ash::CycleUserDirection* out) {
+    switch (input) {
+      case ash::mojom::CycleUserDirection::NEXT:
+        *out = ash::CycleUserDirection::NEXT;
+        return true;
+      case ash::mojom::CycleUserDirection::PREVIOUS:
+        *out = ash::CycleUserDirection::PREVIOUS;
+        return true;
+    }
+    NOTREACHED();
+    return false;
+  }
+};
+
 }  // namespace mojo
 
 #endif  // ASH_PUBLIC_INTERFACES_SESSION_CONTROLLER_TRAITS_H_