MD Settings: Display: Add unified desktop control and modify api

extensions/common/api/system_display.idl

 // Copyright 2013 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.
 
 // Use the <code>system.display</code> API to query display metadata.
 namespace system.display {
 
   dictionary Bounds {
     // The x-coordinate of the upper-left corner.
     long left;
@@ skipping 111 matching lines @@
 
     // True if this is the primary display.
     boolean isPrimary;
 
     // True if this is an internal display.
     boolean isInternal;
 
     // True if this display is enabled.
     boolean isEnabled;
 
+    // True if this display is in unified desktop mode.

[Devlin, 2017/04/06 00:03:26]

Is it common knowledge what this is?

[stevenjb, 2017/04/06 01:56:09]

None of this API is "common knowledge" :P Expanded the comment to reference the
enableUnifiedDesktop call FWIW.

+    boolean isUnified;
+
     // The number of pixels per inch along the x-axis.
     double dpiX;
 
     // The number of pixels per inch along the y-axis.
     double dpiY;
 
     // The display's clockwise rotation in degrees relative to the vertical
     // position.
     // Currently exposed only on ChromeOS. Will be set to 0 on other platforms.
     long rotation;
@@ skipping 169 matching lines @@
     // display.
     // |id|: The display's unique identifier.
     static void clearTouchCalibration(DOMString id);
   };
 
   interface Events {
     // Fired when anything changes to the display configuration.
     static void onDisplayChanged();
   };
 };