Refleshes display info when the chrome://settings/display dialog gets visible.

chrome/browser/resources/options2/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.define('options', function() {
   var OptionsPage = options.OptionsPage;
 
   // The scale ratio of the display rectangle to its original size.
   /** @const */ var VISUAL_SCALE = 1 / 10;
 
@@ skipping 38 matching lines @@
 
       $('display-options-toggle-mirroring').onclick = (function() {
         this.mirroring_ = !this.mirroring_;
         chrome.send('setMirroring', [this.mirroring_]);
       }).bind(this);
 
       $('display-options-apply').onclick = this.applyResult_.bind(this);
       chrome.send('getDisplayInfo');
     },
 
+    /** @override */
+    onVisibilityChanged_: function() {
+      OptionsPage.prototype.onVisibilityChanged_(this);
+      if (this.visible)
+        chrome.send('getDisplayInfo');
+    },
+
     /**
      * Collects the current data and sends it to Chrome.
      * @private
      */
     applyResult_: function() {
       // Offset is calculated from top or left edge.
       var primary = this.displays_[0];
       var secondary = this.displays_[1];
       var offset;
       if (this.layout_ == SecondaryDisplayLayout.LEFT ||
@@ skipping 369 matching lines @@
       mirroring, displays, layout, offset) {
     DisplayOptions.getInstance().onDisplayChanged_(
         mirroring, displays, layout, offset);
   };
 
   // Export
   return {
     DisplayOptions: DisplayOptions
   };
 });