[uber page] Migrate the virtual keyboard sub-page to a dialog

chrome/browser/resources/options2/options_page.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() {
   /////////////////////////////////////////////////////////////////////////////
   // OptionsPage class:
 
   /**
    * Base class for options page.
@@ skipping 276 matching lines @@
    */
   OptionsPage.isOverlayVisible_ = function() {
     return this.getVisibleOverlay_() != null;
   };
 
   /**
    * Returns the currently visible overlay, or null if no page is visible.
    * @return {OptionPage} The visible overlay.
    */
   OptionsPage.getVisibleOverlay_ = function() {
+    var topmostPage = null;
     for (var name in this.registeredOverlayPages) {
       var page = this.registeredOverlayPages[name];
-      if (page.visible)
-        return page;
+      if (page.visible &&
+          (!topmostPage || page.nestingLevel > topmostPage.nestingLevel)) {
+        topmostPage = page;
+      }
     }
-    return null;
+    return topmostPage;
   };
 
   /**
    * Closes the visible overlay. Updates the history state after closing the
    * overlay.
    */
   OptionsPage.closeOverlay = function() {
     var overlay = this.getVisibleOverlay_();
     if (!overlay)
       return;
@@ skipping 786 matching lines @@
     canShowPage: function() {
       return true;
     },
   };
 
   // Export
   return {
     OptionsPage: OptionsPage
   };
 });