It is time.

ui/compositor/layer_type.h

-// Copyright (c) 2012 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 UI_COMPOSITOR_LAYER_TYPE_H_
-#define UI_COMPOSITOR_LAYER_TYPE_H_
-
-namespace ui {
-
-enum LayerType {
-  // A layer that has no onscreen representation (note that its children will
-  // still be drawn, though).
-  LAYER_NOT_DRAWN = 0,
-
-  // A layer that has a texture.
-  LAYER_TEXTURED = 1,
-
-  // A layer that's drawn as a single color.
-  LAYER_SOLID_COLOR = 2,
-
-  // A layer based on the NinePatchLayer class.
-  LAYER_NINE_PATCH = 3,
-};
-
-}  // namespace ui
-
-#endif  // UI_COMPOSITOR_LAYER_TYPE_H_