MD User Manager: Display error message when all profiles are locked.

chrome/browser/resources/md_user_manager/user_manager.js

Index: chrome/browser/resources/md_user_manager/user_manager.js
diff --git a/chrome/browser/resources/md_user_manager/user_manager.js b/chrome/browser/resources/md_user_manager/user_manager.js
index 6864f2c15aee827e7fb3d549e0cf1d4bd0b9f64e..24e329aedb5316dda10467e342773947191324b1 100644
--- a/chrome/browser/resources/md_user_manager/user_manager.js
+++ b/chrome/browser/resources/md_user_manager/user_manager.js
@@ -66,6 +66,7 @@ cr.define('cr.ui', function() {
 
     signin.ProfileBrowserProxyImpl.getInstance().initializeUserManager(
         window.location.hash);
+    cr.addWebUIListener('show-error-dialog', cr.ui.UserManager.showErrorDialog);
   };
 
   /**
@@ -132,6 +133,14 @@ cr.define('cr.ui', function() {
     DisplayManager.clearErrors();
   };
 
+  /**
+   * Shows the error dialog populated with the given message.
+   * @param {string} message Error message to show.
+   */
+  UserManager.showErrorDialog = function(message) {
+    document.querySelector('error-dialog').show(message);
+  };
+
   // Export
   return {
     UserManager: UserManager