chromeos: changes how DisplayManagerObservers are notified

services/ui/ws/display_creation_config.h

+// Copyright 2017 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 SERVICES_UI_WS_DISPLAY_CREATION_CONFIG_H_
+#define SERVICES_UI_WS_DISPLAY_CREATION_CONFIG_H_
+
+namespace ui {
+namespace ws {
+
+enum class DisplayCreationConfig {
+  // Initial state.
+  UNKNOWN,
+
+  // Displays are created automatically based on the system.
+  AUTOMATIC,
+
+  // Used when the window manager manually creates displays.
+  MANUAL,
+};
+
+}  // namespace ws
+}  // namespace ui
+
+#endif  // SERVICES_UI_WS_DISPLAY_CREATION_CONFIG_H_