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

chrome/browser/resources/options2/options_page.js

Index: chrome/browser/resources/options2/options_page.js
diff --git a/chrome/browser/resources/options2/options_page.js b/chrome/browser/resources/options2/options_page.js
index 7b16dcc89f86af5ed44e868e2708fbb828eb9e41..5c9f60d49575285102be30605d6e62a50a4608f7 100644
--- a/chrome/browser/resources/options2/options_page.js
+++ b/chrome/browser/resources/options2/options_page.js
@@ -294,12 +294,15 @@ cr.define('options', function() {
    * @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;
   };
 
   /**