MD Settings: Potential <dialog> close focus workaround, WIP

ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js

Index: ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js
diff --git a/ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js b/ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js
index d15ed9b8173a769d12afe886806d1509a99cfffc..7660cf5e30f558c485ad9ece70385b4c088a4ee8 100644
--- a/ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js
+++ b/ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js
@@ -43,7 +43,7 @@ Polymer({
 
   cancel: function() {
     this.fire('cancel');
-    HTMLDialogElement.prototype.close.call(this, '');
+    this.close('');
   },
 
   /**
@@ -51,7 +51,11 @@ Polymer({
    * @override
    */
   close: function(opt_returnValue) {
-    HTMLDialogElement.prototype.close.call(this, 'success');
+    var returnValue = opt_returnValue == '' ? opt_returnValue : 'success';
+    // Moving the focus to a child of |this| that resides outside the
+    // |this.shadowRoot| seems to cause the focus to not be lost.
+    this.querySelector('paper-button').focus();
+    HTMLDialogElement.prototype.close.call(this, returnValue);
   },
 
   /** @return {!PaperIconButtonElement} */