Chrome OS: Ash support for >=3 displays.

ui/display/types/display_constants.h

 // Copyright 2014 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_DISPLAY_TYPES_DISPLAY_CONSTANTS_H_
 #define UI_DISPLAY_TYPES_DISPLAY_CONSTANTS_H_
 
 namespace ui {
 
 // Used to describe the state of a multi-display configuration.
 enum MultipleDisplayState {
   MULTIPLE_DISPLAY_STATE_INVALID,
   MULTIPLE_DISPLAY_STATE_HEADLESS,
   MULTIPLE_DISPLAY_STATE_SINGLE,
   MULTIPLE_DISPLAY_STATE_DUAL_MIRROR,
   MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED,
+  // TODO(oshima): consolidate DUAL_EXTENDED and MULTI_EXTENDED.
+  MULTIPLE_DISPLAY_STATE_MULTI_EXTENDED,
 };
 
 // Video output types.
 enum DisplayConnectionType {
   DISPLAY_CONNECTION_TYPE_NONE = 0,
   DISPLAY_CONNECTION_TYPE_UNKNOWN = 1 << 0,
   DISPLAY_CONNECTION_TYPE_INTERNAL = 1 << 1,
   DISPLAY_CONNECTION_TYPE_VGA = 1 << 2,
   DISPLAY_CONNECTION_TYPE_HDMI = 1 << 3,
   DISPLAY_CONNECTION_TYPE_DVI = 1 << 4,
@@ skipping 19 matching lines @@
   COLOR_PROFILE_STANDARD,
   COLOR_PROFILE_DYNAMIC,
   COLOR_PROFILE_MOVIE,
   COLOR_PROFILE_READING,
   NUM_COLOR_PROFILES,
 };
 
 }  // namespace ui
 
 #endif  // UI_DISPLAY_TYPES_DISPLAY_CONSTANTS_H_