In display options, lay out the primary display first

chrome/browser/resources/options/chromeos/display_options.js

 // 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.
 
 cr.exportPath('options');
 
 /**
  * Enumeration of display layout. These values must match the C++ values in
  * ash::DisplayController.
  * @enum {number}
@@ skipping 1025 matching lines @@
       var offset = {
         x: Math.floor(
             this.displaysView_.offsetWidth / 2 -
             (boundingBox.right + boundingBox.left) * this.visualScale_ / 2),
         y: Math.floor(
             this.displaysView_.offsetHeight / 2 -
             (boundingBox.bottom + boundingBox.top) * this.visualScale_ / 2)
       };
 
       // Layout the display rectangles. First layout the primary display and
-      // then layout the secondary which is attached to the primary.
+      // then layout any secondary displays.
+      this.createDisplayLayoutDiv_(
+          this.displayLayoutMap_[this.primaryDisplayId_], layoutType, offset);
       for (var i = 0; i < this.displays_.length; i++) {
-        this.createDisplayLayoutDiv_(
-            this.displayLayoutMap_[this.displays_[i].id], layoutType, offset);
+        if (!this.displays_[i].isPrimary) {
+          this.createDisplayLayoutDiv_(
+              this.displayLayoutMap_[this.displays_[i].id], layoutType, offset);
+        }
       }
     },
 
     /**
      * Called when the display arrangement has changed.
      * @param {options.MultiDisplayMode} mode multi display mode.
      * @param {!Array<!options.DisplayInfo>} displays The list of the display
      *     information.
      * @param {options.DisplayLayoutType} layoutType The layout strategy.
      * @param {number} offset The offset of the secondary display.
@@ skipping 58 matching lines @@
       mode, displays, layoutType, offset) {
     DisplayOptions.getInstance().onDisplayChanged_(
         mode, displays, layoutType, offset);
   };
 
   // Export
   return {
     DisplayOptions: DisplayOptions
   };
 });